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Change notes from older releases. For current info see RELEASE-NOTES-1.26.

== MediaWiki 1.25 ==

=== Configuration changes in 1.25 ===
* $wgPageShowWatchingUsers was removed.
* $wgLocalVirtualHosts has been added to replace $wgConf->localVHosts.
* $wgAntiLockFlags was removed.
* $wgJavaScriptTestConfig was removed.
* Edit tokens returned from User::getEditToken may change on every call. Token
  validity must be checked by passing the user-supplied token to
  User::matchEditToken rather than by testing for equality with a
  newly-generated token.
* (T74951) The UserGetLanguageObject hook may be passed any IContextSource
  for its $context parameter. Formerly it was documented as receiving a
  RequestContext specifically.
* Profiling was restructured and $wgProfiler now requires an 'output' parameter.
  See StartProfiler.sample for details.
* $wgMangleFlashPolicy was added to make MediaWiki's mangling of anything that
  might be a flash policy directive configurable.
* ApiOpenSearch now supports XML output. The OpenSearchXml extension should no
  longer be used. If extracts and page images are desired, the TextExtracts and
  PageImages extensions are required.
* $wgOpenSearchTemplate is deprecated in favor of $wgOpenSearchTemplates.
* Edits are now prepared via AJAX as users type edit summaries. This behavior
  can be disabled via $wgAjaxEditStash.
* (T46740) The temporary option $wgIncludejQueryMigrate was removed, along
  with the jQuery Migrate library, as indicated when this option was provided in
  MediaWiki 1.24.
* ProfilerStandard and ProfilerSimpleTrace were removed. Make sure that any
  StartProfiler.php config is updated to reflect this. Xhprof is available
  for zend/hhvm. Also, for hhvm, one can consider using its xenon profiler.
* Default value of $wgSVGConverters['rsvg'] now uses the 'rsvg-convert' binary
  rather than 'rsvg'.
* Default value of $wgSVGConverters['ImageMagick'] now uses transparent
  background with white fallback color, rather than just white background.
 * MediaWikiBagOStuff class removed, make sure any object cache config
   uses SqlBagOStuff instead.
* The 'daemonized' flag must be set to true in $wgJobTypeConf for any redis
  job queues. This means that mediawiki/services/jobrunner service has to
  be installed and running for any such queues to work.
* $wgAutopromoteOnce no longer supports the 'view' event. For keeping some
  compatibility, any 'view' event triggers will still trigger on 'edit'.
* $wgExtensionDirectory was added for when your extensions directory is somewhere
  other than $IP/extensions (as $wgStyleDirectory does with the skins directory).

=== New features in 1.25 ===
* (T64861) Updated plural rules to CLDR 26. Includes incompatible changes
  for plural forms in Russian, Prussian, Tagalog, Manx and several languages
  that fall back to Russian.
* (T60139) ResourceLoaderFileModule now supports language fallback
  for 'languageScripts'.
* Added a new hook, "ContentAlterParserOutput", to allow extensions to modify the
  parser output for a content object before links update.
* (T37785) Enhanced recent changes and extended watchlist are now default.
  Documentation: https://meta.wikimedia.org/wiki/Help:Enhanced_recent_changes
  and https://www.mediawiki.org/wiki/Manual:$wgDefaultUserOptions.
* (T69341) SVG images will no longer be base64-encoded when being embedded
  in CSS. This results in slight size increase before gzip compression (due to
  percent-encoding), but up to 20% decrease after it.
* Update jStorage to v0.4.12.
* MediaWiki now natively supports page status indicators: icons (or short text
  snippets) usually displayed in the top-right corner of the page. They have
  been in use on Wikipedia for a long time, implemented using templates and CSS
  absolute positioning.
  - Basic wikitext syntax: <indicator name="foo">[[File:Foo.svg|20px]]</indicator>
  - Usage instructions: https://www.mediawiki.org/wiki/Help:Page_status_indicators
  - Adjusting custom skins to support indicators:
    https://www.mediawiki.org/wiki/Manual:Skinning#Page_status_indicators
* Edit tokens may now be time-limited: passing a maximum age to
  User::matchEditToken will reject any older tokens.
* The debug logging internals have been overhauled, and are now using the
  PSR-3 interfaces.
* Update CSSJanus to v1.1.1.
* Update lessphp to v0.5.0.
* Added a hook, "ApiOpenSearchSuggest", to allow extensions to provide extracts
  and images for ApiOpenSearch output. The semantics are identical to the
  "OpenSearchXml" hook provided by the OpenSearchXml extension.
* PrefixSearchBackend hook now has an $offset parameter. Combined with $limit,
  this allows for pagination of prefix results. Extensions using this hook
  should implement supporting behavior. Not doing so can result in undefined
  behavior from API clients trying to continue through prefix results.
* Update jQuery from v1.11.1 to v1.11.3.
* External libraries installed via composer will now be displayed
  on Special:Version in their own section. Extensions or skins that are
  installed via composer will not be shown in this section as it is assumed
  they will add the proper credits to the skins or extensions section. They
  can also be accessed through the API via the new siprop=libraries to
  ApiQuerySiteInfo.
* Update QUnit from v1.14.0 to v1.16.0.
* Update Moment.js from v2.8.3 to v2.8.4.
* Special:Tags now allows for manipulating the list of user-modifiable change
  tags.
* Added 'managetags' user right and 'ChangeTagCanCreate', 'ChangeTagCanDelete',
  and 'ChangeTagCanCreate' hooks to allow for managing user-modifiable change
  tags.
* Added 'ChangeTagsListActive' hook, to separate the concepts of "defined" and
  "active" formerly conflated by the 'ListDefinedTags' hook.
* Added TemplateParser class that provides a server-side interface to cachable
  dynamically-compiled Mustache templates (currently uses lightncandy library).
* Clickable anchors for each section heading in the content are now generated
  and appear in the gutter on hovering over the heading.
* Added 'CategoryViewer::doCategoryQuery' and 'CategoryViewer::generateLink' hooks
  to allow extensions to override how links to pages are rendered within NS_CATEGORY
* (T19665) Special:WantedPages only lists page which having at least one red link
  pointing to it.
* New hooks 'ApiMain::moduleManager' and 'ApiQuery::moduleManager', can be
  used for conditional registration of API modules.
* New hook 'EnhancedChangesList::getLogText' to alter, remove or add to the
  links of a group of changes in EnhancedChangesList.
* A full interface for StatsD metric reporting has been added to the context
  interface, reachable via IContextSource::getStats().
* Move the jQuery Client library from being mastered in MediaWiki as v0.1.0 to a
  proper, published library, which is now tagged as v1.0.0.
* A new message (defaulting to blank), 'editnotice-notext', can be shown to users
  when they are editing if no edit notices apply to the page being edited.
* (T94536) You can now make the sitenotice appear to logged-in users only by
  editing MediaWiki:Anonnotice and replacing its content with "". Setting it to
  "-" (default) will continue disable it and fallback to MediaWiki:Sitenotice.
* Modifying the tagging of a revision or log entry is now available via
  Special:EditTags, generally accessed via the revision-deletion-like interface
  on history pages and Special:Log is likely to be more useful.
* Added 'applychangetags' and 'changetags' user rights.
* (T35235) LogFormatter subclasses are now responsible for formatting the
  parameters for API log event output. Extensions should implement the new
  getParametersForApi() method in their log formatters.

==== External libraries ====
* MediaWiki now requires certain external libraries to be installed. In the past
  these were bundled inside the Git repository of MediaWiki core, but now they
  need to be installed separately. For users using the tarball, this will be taken
  care of and no action will be required. Users using Git will either need to use
  composer to fetch dependencies or use the mediawiki/vendor repository which includes
  all dependencies for MediaWiki core and ones used in Wikimedia deployment. Detailed
  instructions can be found at:
  https://www.mediawiki.org/wiki/Download_from_Git#Fetch_external_libraries
* The following libraries are now required:
** psr/log
   This library provides the interfaces set by the PSR-3 standard (http://www.php-fig.org/psr/psr-3/)
   which are used by MediaWiki internally via the
   MediaWiki\Logger\LoggerFactory class.
   See the structured logging RfC (https://www.mediawiki.org/wiki/Requests_for_comment/Structured_logging)
   for more background information.
** cssjanus/cssjanus
   This library was formerly bundled with MediaWiki core and has been removed.
   It automatically flips CSS for RTL support.
** leafo/lessphp
   This library was formerly bundled with MediaWiki core and has been removed.
   It compiles LESS files into CSS.
** wikimedia/cdb
   This library was formerly a part of MediaWiki core, and has been moved into a separate library.
   It provides CDB functions which are used in the Interwiki and Localization caches.
   More information about the library can be found at https://www.mediawiki.org/wiki/CDB.
** liuggio/statsd-php-client
   This library provides a StatsD client API for logging application metrics to a remote server.

=== Bug fixes in 1.25 ===
* (T73003) No additional code will be generated to try to load CSS-embedded
  SVG images in Internet Explorer 6 and 7, as they don't support them anyway.
* (T69021) On Special:BookSources, corrected validation of ISBNs (both
  10- and 13-digit forms) containing "X".
* Page moving was refactored into a MovePage class. As part of that:
** The AbortMove hook was removed.
** MovePageIsValidMove is for extensions to specify whether a page
   cannot be moved for technical reasons, and should not be overridden.
** MovePageCheckPermissions is for checking whether the given user is
   allowed to make the move.
** Title::moveNoAuth() was deprecated. Use the MovePage class instead.
** Title::moveTo() was deprecated. Use the MovePage class instead.
** Title::isValidMoveOperation() broken down into MovePage::isValidMove()
   and MovePage::checkPermissions().
* (T18530) Multiple autocomments are now formatted in an edit summary.
* (T70361) Autocomments containing "/*" are parsed correctly.
* The Special:WhatLinksHere page linked from 'Number of redirects to this page'
  on action=info about a file page does not list file links anymore.
* (T78637) Search bar is not autofocused unless it is empty so that proper scrolling using arrow keys is possible.
* (T50853) Database::makeList() modified to handle 'NULL' separately when building IN clause
* (T85192) Captcha position modified in Usercreate template. As a result:
** extrafields parameter added to Usercreate.php to insert additional data
** 'extend' method added to QuickTemplate to append additional values to any field of data array
* (T86974) Several Title methods now load from the database when necessary
  (instead of returning incorrect results) even when the page ID is known.
* (T74070) Duplicate search for archived files on file upload now omits the extension.
  This requires the fa_sha1 field being populated.
* Removed rel="archives" from the "View history" link, as it did not pass
  HTML validation.
* $wgUseTidy is now set when parserTests are run with the tidy option to match
  output on wiki.
* (T37472) update.php will purge ResourceLoader cache unless --nopurge is passed to it.
* (T72109) mediawiki.language should respect $wgTranslateNumerals in convertNumber().

=== Action API changes in 1.25 ===
* (T67403) XML tag highlighting is now only performed for formats
  "xmlfm" and "wddxfm".
* action=paraminfo supports generalized submodules (modules=query+value),
  querymodules and formatmodules are deprecated
* action=paraminfo no longer outputs descriptions and other help text by
  default. If needed, it may be requested using the new 'helpformat' parameter.
* action=help has been completely rewritten, and outputs help in HTML
  rather than plain text.
* Hitting api.php without specifying an action now displays only the help for
  the main module, with links to submodule help.
* API help is no longer displayed on errors.
* 'uselang' is now a recognized API parameter; "uselang=user" may be used to
  explicitly select the language from the current user's preferences, and
  "uselang=content" may be used to select the wiki's content language.
* Default output format for the API is now jsonfm.
* Simplified continuation will return a "batchcomplete" property in the result
  when a batch of pages is complete.
* Pretty-printed HTML output now has nicer formatting and (if available)
  better syntax highlighting.
* Deprecated list=deletedrevs in favor of newly-added prop=deletedrevisions and
  list=alldeletedrevisions.
* prop=revisions will gracefully continue when given too many revids or titles,
  rather than just ignoring the extras.
* prop=revisions will no longer die if rvcontentformat doesn't match a
  revision's content model; it will instead warn and omit the content.
* If the user has the 'deletedhistory' right, action=query's revids parameter
  will now recognize deleted revids.
* prop=revisions may be used as a generator, generating revids.
* (T68776) format=json results will no longer be corrupted when
  $wgMangleFlashPolicy is in effect. format=php results will cleanly return an
  error instead of returning invalid serialized data.
* Generators may now return data for the generated pages when used with
  action=query.
* Query page data for generator=search and generator=prefixsearch will now
  include an "index" field, which may be used by the client for sorting the
  search results.
* ApiOpenSearch now supports XML output.
* ApiOpenSearch will now output descriptions and URLs as array indexes 2 and 3
  in JSON format.
* (T76051) list=tags will now continue correctly.
* (T76052) list=tags can now indicate whether a tag is defined.
* (T75522) list=prefixsearch now supports continuation
* (T78737) action=expandtemplates can now return page properties.
* (T78690) list=allimages now accepts multiple pipe-separated values
  for the 'aimime' parameter.
* prop=info with inprop=protections will now return applicable protection types
  with the 'restrictiontypes' key.
* (T85417) When resolving redirects, ApiPageSet will now add the targets of
  interwiki redirects to the list of interwiki titles.
* (T85417) When outputting the list of redirect titles, a 'tointerwiki'
  property (like the existing 'tofragment' property) will be set.
* Added action=managetags to allow for managing the list of
  user-modifiable change tags. Actually modifying the tagging of a revision or
  log entry is not implemented yet.
* list=tags has additional properties to indicate 'active' status and tag
  sources.
* siprop=libraries was added to ApiQuerySiteInfo to list installed external libraries.
* (T88010) Added action=checktoken, to test a CSRF token's validity.
* (T88010) Added intestactions to prop=info, to allow querying of
  Title::userCan() via the API.
* Default type param for query list=watchlist and list=recentchanges has
  been changed from all types (e.g. including 'external') to 'edit|new|log'.
* Added formatversion to format=json. Still "experimental" as further changes
  to the output formatting might still be made.
* (T73020) Log event details are now always under a 'params' subkey for
  list=logevents, and a 'logparams' subkey for list=watchlist and
  list=recentchanges.
* Log event details are changing formatting:
  * block events now report flags as an array rather than as a comma-separated
    list.
  * patrol events now report the 'auto' flag as a boolean (absent/empty string
    for BC formats) rather than as an integer.
  * rights events now report the old and new group lists as arrays rather than
    as comma-separated lists.
  * merge events use new-style formatting.
  * delete/event and delete/revision events use new-style formatting.
* The root node and various other nodes will now always be an object in formats
  such as json that distinguish between arrays and objects.
  * Except for action=opensearch where the spec requires an array.

=== Action API internal changes in 1.25 ===
* ApiHelp has been rewritten to support i18n and paginated HTML output.
  Most existing modules should continue working without changes, but should do
  the following:
  * Add an i18n message "apihelp-{$moduleName}-description" to replace getDescription().
  * Add i18n messages "apihelp-{$moduleName}-param-{$param}" for each parameter
    to replace getParamDescription(). If necessary, the settings array returned
    by getParams() can use the new ApiBase::PARAM_HELP_MSG key to override the
    message.
  * Implement getExamplesMessages() to replace getExamples().
* Modules with submodules (like action=query) must have their submodules
  override ApiBase::getParent() to return the correct parent object.
* The 'APIGetDescription' and 'APIGetParamDescription' hooks are deprecated,
  and will have no effect for modules using i18n messages. Use
  'APIGetDescriptionMessages' and 'APIGetParamDescriptionMessages' instead.
* Api formatters will no longer be asked to display the help screen on errors.
* ApiMain::getCredits() was removed. The credits are available in the
  'api-credits' i18n message.
* ApiFormatBase has been changed to support i18n and syntax highlighting via
  extensions with the new 'ApiFormatHighlight' hook. Core syntax highlighting
  has been removed.
* ApiFormatBase now always buffers. Output is done when
  ApiFormatBase::closePrinter is called.
* Much of the logic in ApiQueryRevisions has been split into ApiQueryRevisionsBase.
* The 'revids' parameter supplied by ApiPageSet will now count deleted
  revisions as "good" if the user has the 'deletedhistory' right. New methods
  ApiPageSet::getLiveRevisionIDs() and ApiPageSet::getDeletedRevisionIDs() are
  provided to access just the live or just the deleted revids.
* Added ApiPageSet::setGeneratorData() and ApiPageSet::populateGeneratorData()
  to allow generators to include data in the action=query result.
* New hooks 'ApiMain::moduleManager' and 'ApiQuery::moduleManager', can be
  used for conditional registration of API modules.
* Added ApiBase::lacksSameOriginSecurity() to allow modules to easily check if
  the current request was sent with the 'callback' parameter (or any future
  method that breaks the same-origin policy).
* Profiling methods in ApiBase are deprecated and no longer need to be called.
* ApiResult was greatly overhauled. See inline documentation for details.
* ApiResult will automatically convert objects to strings or arrays (depending
  on whether a __toString() method exists on the object), and will refuse to
  add unsupported value types.
  * An informal interface, ApiSerializable, exists to override the default
    object conversion.
* ApiResult/ApiFormatBase "raw mode" is deprecated.
* ApiFormatXml now assumes defaults and so on instead of throwing errors when
  metadata isn't set.
* (T35235) LogFormatter subclasses are now responsible for formatting log event
  parameters for the API.
* Many modules have changed result data formats. While this shouldn't affect
  clients not using the experimental formatversion=2, code using
  ApiResult::getResultData() without the transformations for backwards
  compatibility may need updating, as will code that wasn't following the old
  conventions for API boolean output.
* The following methods have been deprecated and may be removed in a future
  release:
  * ApiBase::getDescription
  * ApiBase::getParamDescription
  * ApiBase::getExamples
  * ApiBase::makeHelpMsg
  * ApiBase::makeHelpArrayToString
  * ApiBase::makeHelpMsgParameters
  * ApiBase::getModuleProfileName
  * ApiBase::profileIn
  * ApiBase::profileOut
  * ApiBase::safeProfileOut
  * ApiBase::getProfileTime
  * ApiBase::profileDBIn
  * ApiBase::profileDBOut
  * ApiBase::getProfileDBTime
  * ApiBase::getResultData
  * ApiFormatBase::setUnescapeAmps
  * ApiFormatBase::getWantsHelp
  * ApiFormatBase::setHelp
  * ApiFormatBase::formatHTML
  * ApiFormatBase::setBufferResult
  * ApiFormatBase::getDescription
  * ApiFormatBase::getNeedsRawData
  * ApiMain::setHelp
  * ApiMain::reallyMakeHelpMsg
  * ApiMain::makeHelpMsgHeader
  * ApiResult::setRawMode
  * ApiResult::getIsRawMode
  * ApiResult::getData
  * ApiResult::setElement
  * ApiResult::setContent
  * ApiResult::setIndexedTagName_recursive
  * ApiResult::setIndexedTagName_internal
  * ApiResult::setParsedLimit
  * ApiResult::beginContinuation
  * ApiResult::setContinueParam
  * ApiResult::setGeneratorContinueParam
  * ApiResult::endContinuation
  * ApiResult::size
  * ApiResult::convertStatusToArray
  * ApiQueryImageInfo::getPropertyDescriptions
  * ApiQueryLogEvents::addLogParams
* The following classes have been deprecated and may be removed in a future
  release:
  * ApiQueryDeletedrevs

=== Languages updated in 1.25 ===

MediaWiki supports over 350 languages. Many localisations are updated
regularly. Below only new and removed languages are listed, as well as
changes to languages because of Bugzilla reports.

* Languages added:
** awa (अवधी / Awadhi), thanks to translator 1AnuraagPandey;
** bgn (بلوچی رخشانی / Western Balochi), thanks to translators
   Baloch Afghanistan, Ibrahim khashrowdi and Rachitrali;
** ses (Koyraboro Senni), thanks to translator Songhay.
* (T66440) Kazakh (kk) wikis should no longer forcefully reset the user's
  interface language to kk where unexpected.
* The Chinese conversion table was substantially updated to fix a lot of
  bugs and ensure better reading experience for different variants.

=== Other changes in 1.25 ===
* (T45591) Links to MediaWiki.org translatable help were added to indicators,
  mostly in special pages. Local custom target titles can be placed in the
  relevant '(namespace-X|action name|special page name)-helppage' system
  message. Extensions can use the addHelpLink() function to do the same.
* The skin autodiscovery mechanism, deprecated in MediaWiki 1.23, has been
  removed. See https://www.mediawiki.org/wiki/Manual:Skin_autodiscovery for
  migration guide for creators and users of custom skins that relied on it.
* Javascript variables 'wgFileCanRotate' and 'wgFileExtensions' now only
  available on Special:Upload.
* (T58257) Set site logo from mediawiki.skinning.interface module instead of
  inline styles in the HTML.
* Removed ApiQueryUsers::getAutoGroups(). (deprecated since 1.20)
* Removed XmlDumpWriter::schemaVersion(). (deprecated since 1.20)
* Removed LogEventsList::getDisplayTitle(). (deprecated since 1.20)
* Removed Preferences::trySetUserEmail(). (deprecated since 1.20)
* Removed mw.user.name() and mw.user.anonymous() methods. (deprecated since 1.20)
* Removed 'ok' and 'err' parameters in the mediawiki.api modules. (deprecated
  since 1.20)
* Removed 'async' parameter from the  mw.Api#getCategories() method. (deprecated
  since 1.20)
* Removed 'jquery.json' module. (deprecated since 1.24)
  Use the 'json' module and global JSON object instead.
* Deprecated OutputPage::readOnlyPage() and OutputPage::rateLimited().
  Also, the former will now throw an MWException if called with one or more
  arguments.
* Removed hitcounters and associated code.
* The "temp" zone of the upload respository is now considered private. If it
  already exists (such as under the images/ directory), please make sure that
  the directory is not web readable (e.g. via a .htaccess file).
* BREAKING CHANGE: In the XML dump format used by Special:Export and
  dumpBackup.php, the <model> and <format> tags now apprear before the <text>
  tag, instead of after the <text> and <sha1> tags.
  The new schema version is 0.10, the new schema URI is:
  https://www.mediawiki.org/xml/export-0.10.xsd
* MWFunction::call() and MWFunction::callArray() were removed, having being
  deprecated in 1.22.
* Deprecated the getInternalLinkAttributes, getInternalLinkAttributesObj,
  and getInternalLinkAttributes methods in Linker, and removed
  getExternalLinkAttributes method, which was deprecated in MediaWiki 1.18.
* Removed Sites class, which was deprecated in 1.21 and replaced by SiteSQLStore.
* Added wgRelevantArticleId to the client-side config, for use on special pages.
* Deprecated the TitleIsCssOrJsPage hook. Superseded by the
  ContentHandlerDefaultModelFor hook since MediaWiki 1.21.
* Deprecated the TitleIsWikitextPage hook. Superseded by the
  ContentHandlerDefaultModelFor hook since MediaWiki 1.21.
* Changed parsing of variables in schema (.sql) files:
** The substituted values are no longer parsed. (Formerly, several passes
   were made for each variable, so depending on the order in which variables
   were defined, variables might have been found inside encoded values. This
   is no longer the case.)
** Variables are no longer string encoded when the /*$var*/ syntax is used.
   If string encoding is necessary, use the '{$var}' syntax instead.
** Variable names must only consist of one or more of the characters
   "A-Za-z0-9_".
** In source text of the form '{$A}'{$B}' or `{$A}`{$B}`, where variable A
   does not exist yet variable B does, the latter may not be replaced.
   However, this difference is unlikely to arise in practice.
* (T67278) RFC, PMID, and ISBN "magic links" must be surrounded by non-word
  characters on both sides.
* The FormatAutocomments hook will now receive $pre and $post as booleans,
  rather than as strings that must be prepended or appended to $comment.
* (T30950, T31025) RFC, PMID, and ISBN "magic links" can no longer contain
  newlines; but they can contain &nbsp; and other non-newline whitespace.
* The 'mediawiki.action.edit' ResourceLoader module no longer generates the edit
  toolbar, which has been moved to a separate 'mediawiki.toolbar' module. If you
  relied on this behavior, update your scripts' dependencies.
* HTMLForm's 'vform' display style has been separated to a subclass. Therefore:
  * HTMLForm::isVForm() is now deprecated.
  * You can no longer do this:
      $form = new HTMLForm( … );
      $form->setDisplayFormat( 'vform' ); // throws exception
    Instead, do this:
      $form = HTMLForm::factory( 'vform', … );
* Deprecated Revision methods getRawUser(), getRawUserText() and getRawComment().
* BREAKING CHANGE: mediawiki.user.generateRandomSessionId:
  The alphabet of the prior string returned was A-Za-z0-9 and now it is 0-9A-F
* (T87504) Avoid serving SVG background-images in CSS for Opera 12, which
  renders them incorrectly when combined with border-radius or background-size.
* Removed maintenance script dumpSisterSites.php.
* DatabaseBase class constructors must be called using the array argument style.
  Ideally, DatabaseBase:factory() should be used instead in most cases.
* Deprecated ParserOutput::addSecondaryDataUpdate and ParserOutput::getSecondaryDataUpdates.
  This is a hard deprecation, with getSecondaryDataUpdates returning an empty array and
  addSecondaryDataUpdate throwing an exception. These functions will be removed in 1.26,
  since they interfere with caching of ParserOutput objects.
* Introduced new hook 'SecondaryDataUpdates' that allows extensions to inject custom updates.
* Introduced new hook 'OpportunisticLinksUpdate' that allows extensions to perform
  updates when a page is re-rendered.
* EditPage::attemptSave has been modified not to call handleStatus itself and
  instead just returns the Status object. Extension calling it should be aware of
  this.
* Removed class DBObject. (unused since 1.10)
* wfDiff() is deprecated.
* The -m (maximum replication lag) option of refreshLinks.php was removed.
  It had no effect since MediaWiki 1.18 and should be removed from any cron
  jobs or similar scripts you may have set up.
* (T85864) The following messages no longer support raw html: redirectto,
  thisisdeleted, viewdeleted, editlink, retrievedfrom, version-poweredby-others,
  retrievedfrom, thisisdeleted, viewsourcelink, lastmodifiedat, laggedslavemode,
  protect-summary-cascade
* All BloomCache related code has been removed. This was largely experimental.
* $wgResourceModuleSkinStyles no longer supports per-module local or remote paths. They
  can only be set for the entire skin.
* Removed global function swap(). (deprecated since 1.24)
* Deprecated the ".php5" file extension entry points and the $wgScriptExtension
  configuration variable. Refer to the ".php" files instead. If you want
  ".php5" URLs to continue to work, set up redirects. In Apache, this can be
  done by enabling mod_rewrite and adding the following rules to your
  configuration:

    RewriteEngine On
    RewriteBase /
    RewriteRule ^(.*)\.php5 $1.php [R=301,L]

* The global importScriptURI and importStylesheetURI functions, as well as the
  loadedScripts object, from wikibits.js (deprecated since 1.17) now emit
  warnings through mw.log.warn when accessed.


== Compatibility ==

MediaWiki 1.25 requires PHP 5.3.3 or later. There is experimental support for
HHVM 3.3.0.

MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
support for them is somewhat less mature. There is experimental support for
Oracle and Microsoft SQL Server.

The supported versions are:

* MySQL 5.0.3 or later
* PostgreSQL 8.3 or later
* SQLite 3.3.7 or later
* Oracle 9.0.1 or later
* Microsoft SQL Server 2005 (9.00.1399)

== Upgrading ==

1.25 has several database changes since 1.24, and will not work without schema
updates. Note that due to changes to some very large tables like the revision
table, the schema update may take quite long (minutes on a medium sized site,
many hours on a large site).

If upgrading from before 1.11, and you are using a wiki as a commons
repository, make sure that it is updated as well. Otherwise, errors may arise
due to database schema changes.

If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
new database fields are filled with data.

If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
with MediaWiki 1.21.

Don't forget to always back up your database before upgrading!

See the file UPGRADE for more detailed upgrade instructions.

For notes on 1.24.x and older releases, see HISTORY.

== MediaWiki 1.24 ==

=== Configuration changes in 1.24 ===
* MediaWiki will no longer run if register_globals is enabled. It has been
  deprecated for 5 years now, and was removed in PHP 5.4. For more information
  about why, see <https://www.mediawiki.org/wiki/register_globals>.
* MediaWiki now requires PHP's iconv extension. openSUSE users may need to
  install the php5-iconv package. Users of other systems may need to add
  extension=iconv.so to php.ini or recompile PHP without --without-iconv.
* MediaWiki will no longer function if magic quotes are enabled. It has
  been deprecated for 5 years now, and was removed in PHP 5.4.
* The server's canonical hostname is available as $wgServerName, which is
  exposed in both mw.config and ApiQuerySiteInfo.
* Introduced $wgPagePropsHaveSortkey as a backwards-compatibility switch,
  for using the old schema of the page_props table, in case the respective
  schema update was not applied.
* $wgSearchEverythingOnlyLoggedIn was removed as the 'searcheverything'
  user option was removed. Use $wgNamespacesToBeSearchedDefault instead or
  if you used to have $wgDefaultUserOptions['searcheverything'] = 1.
* $wgMasterWaitTimeout has been deprecated.
* $wgDBClusterTimeout has been removed.
* $wgProxyKey has been removed. It is no longer used by MediaWiki core.
  Ensure $wgSecretKey is set in LocalSettings.php.
* $wgExtraInterlanguageLinkPrefixes is a new configuration variable that
  contains an array of interwiki prefixes that should be treated as language
  prefixes (i.e. turned into interlanguage links when $wgInterwikiMagic is set
  to true).
* $wgParserTestRemote has been removed.
* $wgCountTotalSearchHits has been removed. If you're concerned about efficiency
  of search, you should use something like CirrusSearch instead of built in
  search.
* Users in the 'sysop' group have access to Special:MergeHistory by default.
* $wgFileStore was removed after having been deprecated in 1.17. Alternative
  configurations are $wgDeletedDirectory and $wgHashedUploadDirectory.
* The deprecated $wgUseCommaCount variable has been removed.
* $wgEnableSorbs and $wgSorbsUrl have been removed.
* The UserCryptPassword and UserComparePassword hooks are no longer called.
  Any extensions using them must be updated to use the Password Hashing API.
* $wgCompiledFiles has been removed.
* $wgSortSpecialPages was removed, the listing on Special:SpecialPages is
  now always sorted.
* $wgSpecialPages may now use callback functions as an alternative to plain class names.
  This allows more control over constructor parameters.
* $wgHTCPMulticastAddress, $wgHTCPMulticastRouting and $wgHTCPPort were removed.
* $wgRC2UDPAddress, $wgRC2UDPInterwikiPrefix, $wgRC2UDPOmitBots, $wgRC2UDPPort
  and $wgRC2UDPPrefix have been removed.
* The default password type for MediaWiki has been changed from MD5 to PBKDF2.
  Password hashes will automatically be updated as users log in. If necessary, the
  old MD5 hashing can be restored by changing $wgPasswordDefault to 'B'. In addition,
  there is a maintenance script wrapOldPassword.php that can wrap all passwords in
  PBKDF2 (or the hashing algorithm of your choice) if you don't want to wait for your
  users to log in.
* $wgImportSources can now either be a regular array, or an associative map
  specifying subprojects on the interwiki map of the target wiki, or a mix of
  the two. Existing configurations will still work.
* Users must be able to edit through a page's protection to be able to delete it.
* The default thumb size ($wgDefaultUserOptions['thumbsize']) is now 300px, up from
  180px. If you have altered the number of entries in $wgThumbLimits for your wiki, you
  may need to adjust your default user settings to compensate for the index change.
* $wgDeferredUpdateList is now deprecated, you should use DeferredUpdates::addUpdate()
  instead.
* $wgCanonicalLanguageLinks has been removed. Per Google recommendations, we
  will not send a rel=canonical pointing to a variant-neutral page, however
  we will send rel=alternate.
* $wgResourceLoaderLESSFunctions has been deprecated and will be removed in the future.
* $wgGoToEdit has been removed. Use the SpecialSearchNogomatch hook for similar
  functionality.

=== New features in 1.24 ===
* Added new hook WatchlistEditorBeforeFormRender, allowing subscribers to
  manipulate the list of pages and/or preload lots of data at once.
* Added new argument &$link in hook WatchlistEditorBuildRemoveLine, allowing the
  link to the title to be changed.
* Added a new hook, "WhatLinksHereProps", to allow extensions to annotate
  WhatLinksHere entries.
* Added a new hook, "ContentGetParserOutput", to customize parser output for
  a given content object.
* Deprecated the hook "ShowRawCssJs", use "ContentGetParserOutput" instead.
* HTMLForm's HTMLTextField now supports the 'url' type.
* HTMLForm fields may now be dynamically hidden based on the values of other
  fields in the form.
* HTMLForm now supports multiple copies of an input field or set of input
  fields, e.g. the form may request "one or more usernames" without having to
  have the user enter delimited list of names into a text field.
* Added a new hook, "SidebarBeforeOutput", to allow to edit the structure of
  the sidebar just before its display.
* (bug 49156) Added the mediawiki.cookie ResourceLoader module, which wraps
  jquery.cookie so that getting/setting a cookie is syntactically and
  functionally similar to using the WebRequest::getCookie() and
  WebResponse::setcookie() methods.
* (bug 44740) jQuery upgraded from 1.8.3 to 1.11.1. A new configuration option,
  $wgIncludejQueryMigrate, also loads the jQuery Migrate hack to let extensions
  and gadgets use the long-deprecated functions that were removed in jQuery 1.9.
  This option is turned off by default, and will be removed in MediaWiki 1.25.
* (bug 47076) jQuery UI upgraded from 1.8.24 to 1.9.2.
* Changes to content typography (fonts, etc.). See
  https://www.mediawiki.org/wiki/Typography_refresh for further information.
* WikitextContent will now render redirects with the expected "redirect"
  header, rather than as an ordered list. Code calling Article::viewRedirect
  can probably be changed to no longer special-case redirects.
* Header font set to a serif font stack. See
  https://www.mediawiki.org/wiki/Typography_refresh for further information.
* (bug 65567) Added a new hook, "BeforeHttpsRedirect", to allow cancellation of
  the HTTP to HTTPS redirect due to forceHTTPS cookie, userRequires, etc. This
  is only for page views, since this hook doesn't affect UserLogin, OAuth,
  CentralAuth, etc. ATTENTION: This hook is likely to be removed soon due to
  overall design of the system.
* (bug 17367) It is now possible to add pages to your watchlist from
  Special:UnwatchedPages without reloading the special page.
* New methods setVolatile and isVolatile are added to PPFrame, so that
  extensions such as Cite.php can mark that their output is volatile and
  shouldn't be cached.
* (bug 52817) Advanced search options are now saved on the search page itself,
  rather than in a dedicated pane in the preferences panel.
* (bug 44591) The dropdown actions menu (little triangle next to page tabs) in
  the Vector skin has gained a label that should make it more discoverable.
* MWCryptHKDF added for fast, cryptographically secure random number generation
  that won't deplete openssl's entropy pool.
* ResourceLoader: File modules can now provide a skip function that uses an
  inline feature test to bypass loading of the module.
* (bug 20210) Special pages may now provide autocompletion of their subpage
  names in search suggestions. Right now the only useful implementation is in
  Special:Log, but more are to come.
* Special:MostLinkedTemplates is no longer limited to transclusions from the
  Template namespace.
* Skins can now use 'remoteSkinPath' when defining ResourceLoader modules.
  This works the same as 'remoteExtPath' but is relative to the skins/ folder
  instead of the extensions/ folder.
* Added the json2.js polyfill for the ES5 JSON.stringify and JSON.parse methods.
  Exposed as module "json" with a skip function to optimise loading.
* Extensions and skins may now use 'namemsg' in $wgExtensionCredits in addition
  to 'name', to allow for the name to be localizable. 'name' should still be
  specified for backwards-compatibility and to define the path Special:Version
  uses to find extension license information.
* Browser tests are now included to verify basic wiki functionality in developer
  environments. For details on running tests, see tests/browser/README.mediawiki.
* Upgrade jStorage to v0.4.10.
* {{!}} is now a magic word that produces the | character. This removes the need
  for Template:! for purposes such as passing pipes inside of parameters.
* (bug 20790) The block log snippet on Special:Contributions and while
  editing user and user talk pages now works for IP range blocks.
* (bug 9360) Added ability to change the page language for MediaWiki pages using
  Special:PageLanguage. All pages are set to wiki language by default.
  The feature needs to be enabled with $wgPageLanguageUseDB=true and
  permission needs to be set for 'pagelang'.
* Upgrade Moment.js to v2.8.3.
* (bug 67042) Added support for the HTML5 <rtc> tag for East Asian typography.
* Upgrade Sinon.JS to 1.10.3.
* Added the es5-shim polyfill for older or non-compliant javascript engines.
* Upgrade jQuery Cookie to v1.3.1.
* (bug 20476) Add a "viewsuppressed" user right to be able to view
  suppressed content but not suppress it ("suppressrevision" right).
* (bug 66440) The MediaWiki web installer will now allow you to choose the skins
  to enable (from the ones included in download tarball) and decide which one
  should be the default.
* (bug 68085, 68802) Links like [[localInterwikiPrefix:languageCode:pageTitle]],
  where localInterwikiPrefix is a member of the $wgLocalInterwikis array, will
  no longer be displayed in the sidebar when $wgInterwikiMagic is true. In a
  similar way, links like [[localInterwikiPrefix:File:Image.png]] and
  [[localInterwikiPrefix:Category:Hello]] will now render as regular links, and
  will not include the file or add the page to the category.
* New special page, MyLanguage, to redirect users to subpages with localised
  versions of a page. (Integrated from Extension:Translate)
* MediaWiki now supports multiple password types, including bcrypt and PBKDF2.
  The default type can be changed with $wgPasswordDefault and the type
  configurations can be changed with $wgPasswordConfig.
* Skins can now define custom styles for default ResourceLoader modules using
  the $wgResourceModuleSkinStyles global. See the Vector skin for examples.
* (bug 4488) There is now a preference to watch pages where the user has
  rollbacked an edit by default.
* (bug 15484) Users will now be redirected to the login page when they need to
  log in, rather than being shown a page asking them to log in and having to click
  another link to actually get to the login page.
* A JsonContent and JsonContentHandler were added for extensions to extend.
* (bug 35045) Redirects to sections will now update the URL in browser's address
  bar using the HTML5 History API. When [[Dog]] redirects to [[Animals#Dog]],
  the user will now see "Animals#Dog" in their browser instead of "Dog#Dog".
* API token handling has been rewritten. Any API module using tokens will need
  to be updated. See the entry below under "Action API internal changes".
* Added HTMLAutoCompleteSelectField.
* Added a new hook, "SkinPreloadExistence", to allow extensions to add titles to
  link existence cache before the page is rendered.
* Config::set() was moved to its own interface, MutableConfig. GlobalVarConfig::set()
  is now deprecated, does not implement MutableConfig.
* A MutableConfig named HashConfig was added, that stores an array of configuration
  settings.
* (bug 69418) A MultiConfig implementation was added that supports fallback
  to multiple Config instances.
* Update CSSJanus to v1.1.0.
* Added FormatJson::parse() returning status with result or localized error message
* Added DeletedContribsPager::reallyDoQuery hook allowing extensions to data to
  Special:DeletedContributions
* Added DeletedContributionsLineEnding hook allowing extensions to format
  Special:DeletedContributions lines
* (T69525) You can now make MediaWiki speed up its thumbnail rendering by using
  intermediary thumbnails. $wgThumbnailBuckets must be set to a list of target
  thumbnail widths; when a new thumbnail needs to be rendered, MediaWiki will
  find the smallest bucket smaller than the original but larger than the target
  width + $wgThumbnailMinimumBucketDistance, and it will scale that thumbnail,
  rather than the original, down to the target size at greater speed in return
  for minor loss of fidelity.

=== Bug fixes in 1.24 ===
* (bug 50572) MediaWiki:Blockip should support gender
* (bug 49116) Footer copyright notice is now always displayed in user language
  rather than content language (same as copyright notice for editing interface).
* (bug 62258) A bug was fixed in File::getUnscaledThumb when a height
  restriction was present in the parameters. Images with both the "frame"
  option and a size specification set will now always ignore the provided
  size and display an unscaled image, as the documentation has always
  claimed it would.
* (bug 39035) Improved Vector skin performance by removing collapsibleNav,
  which used to collapse some sidebar elements by default.
  This removes -list id suffixes like p-lang-list: instead of using things like
  #p-lang-list, you can do #p-lang .body ul.
* (bug 890) Links in Special:RecentChanges and Special:Watchlist no longer
  follow redirects to their target pages.
* Parser now dies early if called recursively, instead of producing subtle bugs.
* (bug 14323) Redirect pages, when viewed with redirect=no, no longer hide the
  remaining page content.
* (bug 52587) Maintenance script deleteBatch.php no longer follows redirects
  in the file namespace and delete the file on the target page. It will still
  however delete the redirect page.
* (bug 22683) {{msgnw:}} and other uses of PPFrame::RECOVER_ORIG will correctly
  recover the original code of extension tags.
* (bug 65757) MSSQL: Update script drops unnamed constraints to be prepared
  for future updates. Because it's doing so heuristically, it may fail or drop
  wrong constraints.
* (bug 67870) wfShellExec() cuts off stdout at multiples of 8192 bytes.
* $wgRunJobsAsync now works with private wikis (e.g. read requires login).
* (bugs 57238, 65206) Blank pages can now be directly created.
* (bug 69789) Title::getContentModel() now loads from the database when
  necessary instead of incorrectly returning the default content model.
* (bug 69249) wfBaseConvert() now works around PHP Bug #50175 when using GMP.
* (bug 57909) URLs in the externallinks table will no longer have certain
  characters decoded in the query string.
* (bug 67368) LESS mixins like .background-image() correctly flip image
  references for RTL stylesheets now.

=== Action API changes in 1.24 ===
* action=parse API now supports prop=modules, which provides the list of
  ResourceLoader modules that should be used to enhance the parsed content.
* action=query&meta=siteinfo&siprop=interwikimap returns a new "protorel"
  field which is true if protocol-relative urls can be used to access
  a particular interwiki map entry.
* list=logevents now provides logpage, which is the page ID from the
  logging table, if ids are requested and the user has the permissions.
* action=edit now requires that appendtext, prependtext, or section=new be used
  when using the 'redirect' parameter, to prevent clients accidentally
  overwriting the target page with the content of the redirect.
* list=logevents will now return an error if both letitle and leprefix are
  specified.
* list=logevents has a new parameter, lenamespace, to allow filtering by
  namespace.
* action=expandtemplates has a new parameter, prop, and a new output format.
  The old format is still used if prop isn't provided, but this is deprecated.
* meta=userinfo can now return the count of unread pages on the watchlist.
* list=watchlist can now filter by unread status.
* The deprecated action=parse&prop=languageshtml has been removed.
* (bug 48071) action=setnotificationtimestamp no longer throws PHP or database
  errors when no pages are given.
* (bug 60734) Actions that use ApiPageSet (e.g. purge, watch,
  setnotificationtimestamp) will now include continuation information when
  using a generator.
* Removed 'props' and 'errors' from action=paraminfo, as they have extremely
  limited use and are generally inaccurate, unmaintained, and impossible to
  properly maintain.
* Formats dbg, dump, txt, wddx, and yaml are now deprecated.
* action=paraminfo now indicates when a parameter is specifying a submodule.
* The iwurl parameter to prop=iwlinks is deprecated in favor of iwprop=url, for
  parallelism with prop=langlinks.
* All tokens should be fetched from action=query&meta=tokens; all other methods
  of fetching tokens are deprecated. The value needed for meta=tokens's 'type'
  parameter for each module is documented in the action=help output and is
  returned from action=paraminfo.
* New action ClearHasMsg that can be used to clear HasMsg flag.
* The cmstartsortkey and cmendsortkey parameters to list=categorymembers are
  deprecated in favor of cmstarthexsortkey and cmendhexsortkey.
* (bug 63326) Add blockedtimestamp field to output of blockinfo property for
  the list=allusers and list=users modules.
* prop=imageinfo no longer requires iiurlwidth to be set when using iiurlparam.
* Added prop=linkshere, prop=fileusage, and prop=transcludedin, which are
  roughly equivalent to list=backlinks, list=imageusage, and list=embeddedin
  but can work on a list of titles (including titles from a generator).
* prop=redirects can now filter returned redirects by namespace.

=== Action API internal changes in 1.24 ===
* Methods for handling continuation are added to ApiResult, so actions other
  than query that use generators can easily support continuation.
* $wgAPIModules (and the related $wgAPIFormatModules, $wgAPIMetaModules,
  $wgAPIPropModules, and $wgAPIListModules settings) now allow API modules
  to be specified using a "module spec" array instead of a plain class name.
  A "module spec" is an associative array containing at least the 'class' key
  for the module's class, and optionally a 'factory' key for the factory function
  to use for the module. This is intended for extensions that want control over
  the instantiation of their API modules, to allow for proper dependency
  injection.
* A new param type 'submodule' is available. Parameters of this type will take
  the list of valid values from the module's ApiModuleManager for the group
  corresponding to the parameter name.
* The 'APIGetPossibleErrors' and 'APIGetResultProperties' hooks are no longer used.
* API token handling has been rewritten. Any API module using tokens will need
  to be updated:
  * ApiBase::needsToken now returns a token type instead of boolean true when a
    token is needed. Returning true will throw an exception. See documentation
    of that method for details.
  * Information for the 'token' parameter is automatically set by ApiBase
    getFinalParams and getFinalParamDescription.
  * ApiBase::getTokenSalt has been removed.
  * The hooks APIQueryInfoTokens, APIQueryRevisionsTokens,
    APIQueryRecentChangesTokens, APIQueryUsersTokens, and
    ApiTokensGetTokenTypes are deprecated, but are still called to support
    backwards-compatible token access.
* ApiBase::validateLimit and ApiBase::validateTimestamp are now protected.
* ApiQueryRedirects was removed; prop=redirects is now implemented by
  ApiQueryBacklinksProp along with the newly-added prop modules.
* The following methods have been deprecated and may be removed in a future
  release:
  * ApiBase::getResultProperties
  * ApiBase::getFinalResultProperties
  * ApiBase::addTokenProperties
  * ApiBase::getRequireOnlyOneParameterErrorMessages
  * ApiBase::getRequireMaxOneParameterErrorMessages
  * ApiBase::getRequireAtLeastOneParameterErrorMessages
  * ApiBase::getTitleOrPageIdErrorMessage
  * ApiBase::getPossibleErrors
  * ApiBase::getFinalPossibleErrors
  * ApiBase::parseErrors
  * ApiQuery::setGeneratorContinue
  * ApiQueryBase::checkRowCount
  * ApiQueryBase::titleToKey
  * ApiQueryBase::keyToTitle
  * ApiQueryBase::keyPartToTitle
  * ApiQueryInfo::getTokenFunctions
  * ApiQueryInfo::resetTokenCache
  * ApiQueryInfo::getEditToken
  * ApiQueryInfo::getDeleteToken
  * ApiQueryInfo::getProtectToken
  * ApiQueryInfo::getMoveToken
  * ApiQueryInfo::getBlockToken
  * ApiQueryInfo::getUnblockToken
  * ApiQueryInfo::getEmailToken
  * ApiQueryInfo::getImportToken
  * ApiQueryInfo::getWatchToken
  * ApiQueryInfo::getOptionsToken
  * ApiQueryRecentChanges::getTokenFunctions
  * ApiQueryRecentChanges::getPatrolToken
  * ApiQueryRevisions::getTokenFunctions
  * ApiQueryRevisions::getRollbackToken
  * ApiQueryUsers::getTokenFunctions
  * ApiQueryUsers::getUserrightsToken
* The following classes have been deprecated and may be removed in a future
  release:
  * ApiFormatDbg
  * ApiFormatDump
  * ApiFormatTxt
  * ApiFormatWddx
  * ApiFormatYaml
  * ApiTokens
* The following class constants have been deprecated and may be removed in a
  future release:
  * ApiBase::PROP_ROOT
  * ApiBase::PROP_LIST
  * ApiBase::PROP_TYPE
  * ApiBase::PROP_NULLABLE

=== Languages updated in 1.24 ===

MediaWiki supports over 350 languages. Many localisations are updated
regularly. Below only new and removed languages are listed, as well as
changes to languages because of Bugzilla reports.

=== Other changes in 1.24 ===
* The deprecated jquery.delayedBind ResourceLoader module was removed.
* The deprecated function mw.util.toggleToc was removed.
* The Special:Search hooks SpecialSearchGo and SpecialSearchResultsAppend
  were removed as they were unused.
* (bug 65477) User::pingLimiter() now has an additional profile point varying
  by action being used.
* mediawiki.util.$content no longer supports old versions of the Vector,
  Monobook, Modern and CologneBlue skins that don't yet implement the "mw-body"
  and/or "mw-body-primary" class name in their html.
* Added pp_sortkey column to page_props table, so pages can be efficiently
  queried and sorted by property value (bug 58032).
  See $wgPagePropsHaveSortkey if you want to postpone the schema change.
* BREAKING CHANGE: All four built-in MediaWiki skins (Vector, MonoBook, Modern
  and Cologne Blue) were moved out of MediaWiki core to their own respective
  repositories. They will be installed with the release tarball, but you must
  install them separately if installing MediaWiki from source code. A warning
  message displayed until you do it should guide you through the process. See
  also <https://www.mediawiki.org/wiki/Manual:Skin_configuration>.
* BREAKING CHANGE: Skins built for MediaWiki 1.15 and earlier that do not use
  the "headelement" template key are no longer supported. Setting
  $useHeadElement = false; is no longer supported and will not cause old keys
  like "headlinks", "skinnameclass", etc. to be defined.
* BREAKING CHANGE: The files commonElements.css, commonContent.css and
  commonInterface.css (in skins/common/) have been removed. Skins may no longer
  rely on their presence and include them in their style modules. ResourceLoader
  modules introduced in MediaWiki 1.23 should be loaded instead:
  - skins/common/commonElements.css  → 'mediawiki.skinning.elements' module
  - skins/common/commonContent.css   → 'mediawiki.skinning.content' module
  - skins/common/commonInterface.css → 'mediawiki.skinning.interface' module
* The deprecated 'SpecialVersionExtensionTypes' hook was removed.
* (bug 63891) Add 'X-Robots-Tag: noindex' header in action=render pages.
* SpecialPage no longer supports the syntax for invoking wfSpecial*() functions.
  Special pages should subclass SpecialPage and implement the execute() method.
* (bug 63755) The deprecated constants RC_MOVE and RC_MOVE_OVER_REDIRECT were
  removed.
* Special:MostLinkedTemplates has been renamed to Special:MostTranscludedPages.
* The skin autodiscovery mechanism has been deprecated and will be removed in
  MediaWiki 1.25. See https://www.mediawiki.org/wiki/Manual:Skin_autodiscovery
  for migration guide for creators and users of custom skins that relied on it.
* ResourceLoaderFileModule#getAllStyleFiles now returns all style files and all
  skin style files used by the module.
* Removed getLang() from IContextSource and subclasses. (deprecated since 1.19)
* Removed setLang() from subclasses of IContextSource. (deprecated since 1.19)
* Removed WebRequest::escapeAppendQuery(). (deprecated since 1.20)
* Removed info(), purge(), revert() and rollback() from the Article class; they
  have since become subclasses of the Action class. (deprecated since 1.19)
* SearchEngineReplacePrefixesComplete hook was removed.
* The "jquery.json" module has been deprecated. Use the "json" module instead.
* Removed HTMLForm::addJS(). (deprecated since 1.18)
* Removed LogEventsList::showHeader(). (deprecated since 1.19)
* Removed ImageGalleryBase::useSkin(). (deprecated since 1.18)
* Removed DatabaseMysqlBase::getLagFromProcesslist(). (deprecated since 1.19)
* Removed LoadBalancer::closeConnecton(). (deprecated since 1.18)
* Removed ApiBase::createContext(). (deprecated since 1.19)
* BREAKING CHANGE: The undocumented Special{$this->getName()}BeforeFormDisplay
  set of hooks has been removed and replaced by a single new hook
  SpecialPageBeforeFormDisplay.
* (bug 65781) Removed block warning on included {{Special:Contributions}}
* Removed Skin::makeGlobalVariablesScript(). (deprecated since 1.19)
* Removed MWNamespace::isMain(). (deprecated since 1.19)
* Removed Preferences::loadOldSearchNs(). (deprecated since 1.19)
* Removed OutputPage::getStatusMessage(). (deprecated since 1.18)
* Removed OutputPage::isUserJsAllowed(). (deprecated since 1.18)
* Removed Title::updateTitleProtection(). (deprecated since 1.19)
* Removed ParserOptions::setSkin(). (deprecated since 1.19)
* Removed Title::escapeCanonicalURL(). (deprecated since 1.19)
* Removed Title::escapeLocalURL(). (deprecated since 1.19)
* Removed Title::escapeFullURL(). (deprecated since 1.19)
* Removed User::isValidEmailAddr(). (deprecated since 1.18)
* Removed Title::getEscapedText(). (deprecated since 1.19)
* Removed Language::getFallbackLanguageCode(). (deprecated since 1.19)
* Removed WikiPage::isBigDeletion(). (deprecated since 1.19)
* Removed MWInit class which contained functions related to a now discontinued
  PHP compiler called hphpc. (deprecated since 1.22)
* ApiResult::enableSizeCheck() and disableSizeCheck() are now obsolete.
* Removed ResourceLoaderGetStartupModules hook. (deprecated since 1.23)
* Removed getFormFields(), onSubmit() and onSuccess() from FormlessAction, as
  these were meant specifically for FormAction instead.
* Removed Action::execute().
* Removed AjaxAddScript which has been obsolete since ResourceLoader and
  is unused by any modern extension.
* Removed maintenance/nextJobDB.php; no longer in use.
* Removed global function wfViewPrevNext(). (deprecated since 1.19)
* Removed global function xmlsafe() from Export.php. (moved to OAIRepo extension)
* Removed Title::userCanRead(). (deprecated since 1.19)
* Removed maintenance script importTextFile.php. Use edit.php script instead.
* A _from_namespace field has been added to the templatelinks, pagelinks,
  and filelinks tables. Run update.php to apply this change to the schema.
* Removed File::sha1Base36(). (deprecated since 1.19)
* Removed File::getPropsFromPath(). (deprecated since 1.19)
* Removed functions blockedPage(), noCreatePermission(), readOnlyPage() and
  userNotLoggedInPage() from EditPage.php. (deprecated since 1.19)
* Removed functions getContent(), getPreloadedText(), mergeChangesInto() and
  setPreloadedText() from EditPage.php. (deprecated since 1.21)
* Removed global functions wfArrayLookup(), wfArrayMerge(), wfDebugDieBacktrace()
  and wfTime(). (deprecated since 1.22)
* Browser support for Internet Explorer 6 and 7 lowered from Grade A to Grade C,
  meaning that JavaScript is no longer executed in these browser versions.
* Browser support for Opera 11 lowered from Grade A to Grade C.
* Removed IEFixes module which existed purely to provide support for MSIE versions
  below 7 (conditionally loaded only for those browsers).
* Deprecated SpecialPageFactory::getList() in favor of
  SpecialPageFactory::getNames()
* Action::checkCanExecute() no longer has a return value.
* Removed cleanupForIRC(), loadFromCurRow(), newFromCurRow(), notifyRC2UDP()
  and sendToUDP() from RecentChange.php. (deprecated since 1.22)
* Removed EnhancedChangesList::arrow(), sideArrow(), downArrow(), spacerArrow().
* Removed Xml::namespaceSelector(). (deprecated since 1.19)
* Removed WikiPage::estimateRevisionCount(). (deprecated since 1.19)
* MYSQL: Enum item added to "major MIME type" columns.
  Running update.php on MySQL < v5.1 may result in heavy processing.
* RSS and Atom feeds generated by MediaWiki no longer include a fallback
  stylesheet. It was ignored by most browsers these days anyway.
* SpecialSearchNoResults hook has been removed. SpecialSearchResults is now
  called unconditionally.
* TablePager::getBody() is now 'final' and can't be overridden in subclasses.
* TablePager::getBody() is deprecated, use getBodyOutput() or getFullOutput().
* Added $outputPage parameter to the SkinTemplateGetLanguageLink hook.
* log_page for move log entries store the original page ID, rather than that
  of the new redirect page. This is not retroactive.
* LCStoreAccel was removed. $wgLocalisationCacheConf can no longer be set to
  use this store class.
* Html::infoBox() no longer accepts paths relative to skins/common/images/.
* Deprecated defunct Skin::getCommonStylePath().
* Some extensions had their ResourceLoader modules depend on the "mediawiki"
  and "jquery" modules. In the past, this behavior was undefined, now it will
  throw an error.
* Removed BagOStuff::replace(). (deprecated since 1.23)
* In Linker.php, link(), linkText() and makeBrokenImageLinkObj() now display
  warnings if their first parameter is not a Title object. Also makeImageLink()
  now requires a Parser as its first parameter.
* (bug 67368) LESS functions embed() and embeddable(), added in MediaWiki 1.23
  and broken by design, have been removed. Use appropriate LESS mixins instead.
* Removed cssjanus.py from maintenance directory as it was unused.
* Removed maintenance/purgeOldText.inc and the PurgeRedundantText() function
  it contained (superseded by Maintenance::purgeRedundantText() in 1.16).
  The purgeOldText.php maintenance script has been retained.
* PHPUnit tests can be found by directory discovery, by adding the directory
  path from your UnitTestsList callback. Older versions of MediaWiki core will
  barf at this usage.

==== Renamed classes ====
* CLDRPluralRuleConverter_Expression to CLDRPluralRuleConverterExpression
* CLDRPluralRuleConverter_Fragment to CLDRPluralRuleConverterFragment
* CLDRPluralRuleConverter_Operator to CLDRPluralRuleConverterOperator
* CLDRPluralRuleEvaluator_Range to CLDRPluralRuleEvaluatorRange
* CSSJanus_Tokenizer to CSSJanusTokenizer
* MediaWiki_I18N to MediaWikiI18N
* Parser_DiffTest to ParserDiffTest
* RevDel_ArchiveItem to RevDelArchiveItem
* RevDel_ArchiveList to RevDelArchiveList
* RevDel_ArchivedFileItem to RevDelArchivedFileItem
* RevDel_ArchivedFileList to RevDelArchivedFileList
* RevDel_ArchivedRevisionItem to RevDelArchivedRevisionItem
* RevDel_FileItem to RevDelFileItem
* RevDel_FileList to RevDelFileList
* RevDel_Item to RevDelItem
* RevDel_List to RevDelList
* RevDel_LogItem to RevDelLogItem
* RevDel_LogList to RevDelLogList
* RevDel_RevisionItem to RevDelRevisionItem
* RevDel_RevisionList to RevDelRevisionList
* WebInstaller_Complete to WebInstallerComplete
* WebInstaller_Copying to WebInstallerCopying
* WebInstaller_DBConnect to WebInstallerDBConnect
* WebInstaller_DBSettings to WebInstallerDBSettings
* WebInstaller_Document to WebInstallerDocument
* WebInstaller_ExistingWiki to WebInstallerExistingWiki
* WebInstaller_Install to WebInstallerInstall
* WebInstaller_Language to WebInstallerLanguage
* WebInstaller_Name to WebInstallerName
* WebInstaller_Options to WebInstallerOptions
* WebInstaller_Readme to WebInstallerReadme
* WebInstaller_ReleaseNotes to WebInstallerReleaseNotes
* WebInstaller_Restart to WebInstallerRestart
* WebInstaller_Upgrade to WebInstallerUpgrade
* WebInstaller_UpgradeDoc to WebInstallerUpgradeDoc
* WebInstaller_Welcome to WebInstallerWelcome

==== Removed classes ====
* IPBlockForm - Use SpecialBlock directly
* WatchlistEditor - Use SpecialEditWatchlist directly
* FormatExif - Use FormatMetadata directly
* RevertFileAction - Use RevertAction directly
* HistoryPage - Use HistoryAction directly
* RawPage - Use RawAction directly
* StubContLang - Use Language::factory() instead
* XMLReader2 - Use XMLReader directly
* ResourceLoaderLESSFunctions - No longer in use, not intended for public usage

==== Removed files ====
The skins/common/ directory, previously containing some assets intended to be
used by skins and a number of legacy styles and scripts, has been removed. Its
contents have been deleted or relocated into the resources/ directory. Full list
of files that are no longer available follows.

* skins/common/ajax.js
* skins/common/commonContent.css
* skins/common/commonElements.css
* skins/common/commonInterface.css
* skins/common/commonPrint.css
* skins/common/config-cc.css
* skins/common/config.css
* skins/common/config.js
* skins/common/feed.css
* skins/common/IEFixes.js
* skins/common/oldshared.css
* skins/common/protect.js
* skins/common/shared.css
* skins/common/upload.js
* skins/common/wikibits.js
* skins/common/images/add.png
* skins/common/images/ajax-loader.gif
* skins/common/images/arrow_disabled_first_25.png
* skins/common/images/arrow_disabled_last_25.png
* skins/common/images/arrow_disabled_left_25.png
* skins/common/images/arrow_disabled_right_25.png
* skins/common/images/arrow_first_25.png
* skins/common/images/arrow_last_25.png
* skins/common/images/arrow_left_25.png
* skins/common/images/arrow_right_25.png
* skins/common/images/Arr_.png
* skins/common/images/Arr_d.png
* skins/common/images/Arr_l.png
* skins/common/images/Arr_r.png
* skins/common/images/Arr_u.png
* skins/common/images/bullet.gif
* skins/common/images/button_bold.png
* skins/common/images/button_extlink.png
* skins/common/images/button_headline.png
* skins/common/images/button_hr.png
* skins/common/images/button_image.png
* skins/common/images/button_italic.png
* skins/common/images/button_link.png
* skins/common/images/button_media.png
* skins/common/images/button_nowiki.png
* skins/common/images/button_sig.png
* skins/common/images/button_template.png
* skins/common/images/cc-0.png
* skins/common/images/cc-by-nc-sa.png
* skins/common/images/cc-by-sa.png
* skins/common/images/cc-by.png
* skins/common/images/Checker-16x16.png
* skins/common/images/closewindow.png
* skins/common/images/closewindow19x19.png
* skins/common/images/critical-32.png
* skins/common/images/diffunderline.gif
* skins/common/images/download-32.png
* skins/common/images/feed-icon.png
* skins/common/images/feed-icon.svg
* skins/common/images/gnu-fdl.png
* skins/common/images/help-question-hover.gif
* skins/common/images/help-question.gif
* skins/common/images/info-32.png
* skins/common/images/link_icon.gif
* skins/common/images/magnify-clip-rtl.png
* skins/common/images/magnify-clip.png
* skins/common/images/mediawiki.png
* skins/common/images/nextredirectltr.png
* skins/common/images/nextredirectrtl.png
* skins/common/images/poweredby_mediawiki_88x31.png
* skins/common/images/public-domain.png
* skins/common/images/question-small.png
* skins/common/images/question.svg
* skins/common/images/redirectltr.png
* skins/common/images/redirectrtl.png
* skins/common/images/remove.png
* skins/common/images/spinner.gif
* skins/common/images/tick-32.png
* skins/common/images/tipsy-arrow.gif
* skins/common/images/tooltip_icon.png
* skins/common/images/warning-32.png
* skins/common/images/wiki.png
* skins/common/images/Zoom_sans.gif
* skins/common/images/ar/button_bold.png
* skins/common/images/ar/button_headline.png
* skins/common/images/ar/button_italic.png
* skins/common/images/ar/button_link.png
* skins/common/images/ar/button_nowiki.png
* skins/common/images/be-tarask/button_bold.png
* skins/common/images/be-tarask/button_italic.png
* skins/common/images/be-tarask/button_link.png
* skins/common/images/cyrl/button_bold.png
* skins/common/images/cyrl/button_italic.png
* skins/common/images/cyrl/button_link.png
* skins/common/images/de/button_bold.png
* skins/common/images/de/button_italic.png
* skins/common/images/fa/button_bold.png
* skins/common/images/fa/button_headline.png
* skins/common/images/fa/button_italic.png
* skins/common/images/fa/button_link.png
* skins/common/images/fa/button_nowiki.png
* skins/common/images/icons/fileicon-c.png
* skins/common/images/icons/fileicon-cpp.png
* skins/common/images/icons/fileicon-deb.png
* skins/common/images/icons/fileicon-djvu.png
* skins/common/images/icons/fileicon-djvu.xcf
* skins/common/images/icons/fileicon-dvi.png
* skins/common/images/icons/fileicon-exe.png
* skins/common/images/icons/fileicon-h.png
* skins/common/images/icons/fileicon-html.png
* skins/common/images/icons/fileicon-iso.png
* skins/common/images/icons/fileicon-java.png
* skins/common/images/icons/fileicon-mid.png
* skins/common/images/icons/fileicon-mov.png
* skins/common/images/icons/fileicon-o.png
* skins/common/images/icons/fileicon-ogg.png
* skins/common/images/icons/fileicon-ogg.xcf
* skins/common/images/icons/fileicon-pdf.png
* skins/common/images/icons/fileicon-ps.png
* skins/common/images/icons/fileicon-psd.png
* skins/common/images/icons/fileicon-rm.png
* skins/common/images/icons/fileicon-rpm.png
* skins/common/images/icons/fileicon-svg.png
* skins/common/images/icons/fileicon-tar.png
* skins/common/images/icons/fileicon-tex.png
* skins/common/images/icons/fileicon-ttf.png
* skins/common/images/icons/fileicon-txt.png
* skins/common/images/icons/fileicon.png
* skins/common/images/ksh/button_S_italic.png


== MediaWiki 1.23 ==

=== Configuration changes in 1.23 ===
* (bug 13250) Restored method for clearing a watchlist in web UI
  so that users with large watchlists don't have to perform
  contortions to clear them.
* When $wgJobRunRate is higher than zero, jobs are now executed via an
  asynchronous HTTP request to a MediaWiki entry point. This may require
  increasing the number of server worker threads. $wgRunJobsAsync has been
  added to disable this feature if needed, falling back to executing the job
  on the same process but making the execution synchronously.
* $wgDebugLogGroups values may be set to an associative array with a
  'destination' key specifying the log destination. The array may also contain
  a 'sample' key with a positive integer value N indicating that the log group
  should be sampled by dispatching one in every N messages on average. The
  sampling is random.
* In addition to the current exception log format, MediaWiki now serializes
  exception metadata to JSON and logs it to the 'exception-json' log group.
  This makes MediaWiki easier to integrate with log aggregation and analysis
  tools.
* $wgSquidServersNoPurge now supports the use of Classless Inter-Domain
  Routing (CIDR) notation to specify contiguous blocks of IPv4 and/or IPv6
  addresses that should be trusted to provide X-Forwarded-For headers.
* Preferences 'watchcreations', 'watchdefault', 'enotifwatchlistpages' ("Add
  pages I create and files I upload to my watchlist", "Add pages and files I
  edit to my watchlist", "Email me when a page or file on my watchlist is
  changed") are now enabled by default. In addition new user accounts' personal
  and talk pages are now watched by them by default.
* $wgLBFactoryConf: Class names have had underscores removed. The configuration
  should be updated if LBFactory_Simple or LBFactory_Multi is configured.
* $wgPasswordSenderName has been removed and is no longer functional. To set a
  custom mailer name, the system message 'emailsender' should be modified
  (default: "{{SITENAME}}").
* (bug 63269) Email notifications were not correctly handling the
  [[MediaWiki:Helppage]] message being set to a full URL (the default).
  If you customized [[MediaWiki:Enotif body]] (the text of email notifications),
  you'll need to edit it locally to include the URL via the new variable
  $HELPPAGE instead of the parser functions fullurl and canonicalurl; otherwise
  you don't have to do anything.
* $wgDBAhandler was removed as the only class using it was also removed
* The 'max threads' setting was removed from $wgDBservers.
* Support for AdminSettings.php has been completely removed. All configuration
  belongs in LocalSettings.php.
* $wgSkipSkin, which has been replaceable by $wgSkipSkins since 2005 (r9249), is
  now formally deprecated.
* Removed deprecated $wgDisabledActions as it is hardly used anywhere.
* $wgRateLimitLog has been deprecated and replaced by
  $wgDebugLogGroup['ratelimit'].
* $wgLocalInterwikis is an array containing multiple local interwiki prefixes
  (interwiki prefixes that point back to the current wiki). This effectively
  allows more than one value of $wgLocalInterwiki to be specified and
  understood by the parser. The value of $wgLocalInterwiki is automatically
  prepended to the start of this array.
* $wgQueryPages has been removed. Query Pages should be added to by using the
  wgQueryPages hook.
* $wgHttpOnlyBlacklist has been removed.
* $wgLicenseTerms has been removed as it was unused.
* $wgProfileOnly is now deprecated; set the log file in
  $wgDebugLogGroups['profileoutput'] to replace it.
* $wgMaxBacklinksInvalidate was removed; use $wgJobBackoffThrottling instead
* Deprecated ResourceLoaderGetStartupModules hook.

=== New features in 1.23 ===
* ResourceLoader can utilize the Web Storage API to cache modules client-side.
  Compared to the browser cache, caching in Web Storage allows ResourceLoader
  to be more granular about evicting stale modules from the cache while
  retaining the ability to retrieve multiple modules in a single HTTP request.
  This capability can be enabled by setting $wgResourceLoaderStorageEnabled to
  true. This feature is currently considered experimental and should only be
  enabled with care.
* (bug 6092) Add expensive parser functions {{REVISIONID:}}, {{REVISIONUSER:}}
  and {{REVISIONTIMESTAMP:}} (with friends).
* Add "wgRelevantUserName" to mw.config containing the current
  Skin::getRelevantUser value.
* (bug 56033) Add content model to the page information.
* Added Article::MissingArticleConditions hook to give extensions a chance to
  hide their (unrelated) log entries.
* Added LonelyPagesQuery hook to let extensions modify the query used to
  generate Special:LonelyPages.
* Added $wgOpenSearchDefaultLimit defining the default number of entries to show
  on action=opensearch API call.
* For namespaces with $wgNamespaceProtection (including the MediaWiki
  namespace), the "protect" tab will be shown only if there are restriction
  levels available that would restrict editing beyond what
  $wgNamespaceProtection already applies. The protection form will offer only
  those protection levels.
* Added $wgAPIFormatModules, allowing extensions to add additional output
  formatting modules for the API.
* (bug 47812) The MediaWiki:Group-user.{css,js} pages can now be used to add
  custom CSS or JavaScript enabled only for registered users.
* (bug 52005) Special pages RecentChanges, RecentChangesLinked and Watchlist
  now include a legend describing the symbols used in lists of changes.
* Improved the accessibility of the tabs in Special:Preferences.
* Added ApiBeforeMain hook, roughly equivalent to the BeforeInitialize hook:
  it's called after everything is set up but before any major processing
  happens.
* The jquery.client module now performs a component-wise version comparison in
  its #test method when strings are used in the browser map: version '1.10' is
  now correctly considered larger than '1.2'. Using numbers in the version map
  is not affected.
* All API modules now support an assert parameter, which can either be
  'user' or 'bot'. The API will throw an error if the user is not logged
  in (user) or does not have the 'bot' userright (bot). Based off of the
  AssertEdit extension by Steve Sanbeg.
* [[Special:Diff]] was added, allowing users to create internal links to
  revision comparison pages using syntax such as [[Special:Diff/12345]],
  [[Special:Diff/12345/prev]] or [[Special:Diff/12345/98765]].
* New user accounts' personal and talk pages are now watched by them by default.
* Added SkinTemplateGetLanguageLink hook to allow changing the html of language
  links.
* Added MessageCache::get hook as a new way to customize messages across
  multiple sites.
* Added jquery.throttle-debounce ResourceLoader module to limit the number of
  callbacks for frequently occurring events.
* Special:ProtectedPages shows now a table. The timestamp, the reason and
  the protecting user are also shown.
* Added experimental support for using Microsoft SQL Server as the database
  backend.
** Added new Microsoft SQL Server-specific configuration variable
   $wgDBWindowsAuthentication, which makes the web server authenticate against
   the database server using Integrated Windows Authentication instead of
   $wgDBuser/$wgDBpassword.
* HTMLForm 'select', 'selectandother', 'selectorother', 'multiselect', and
  'radio' fields can now use message keys as labels via the 'options-messages'
  parameter, which overrides the 'options' parameter.
* Admins can expire users passwords manually, or on a schedule using the
  $wgPasswordExpirationDays configuration setting.
* Add new hook SendWatchlistEmailNotification, this will be used to determine
  whether to send a watchlist email notification.
* (bug 42026) Special:Contributions now includes an option to filter page
  creations, similar to the topOnly option.
* Add mediawiki.ui.button styling to all pages so wiki content can use styled
  buttons.
* Special:UserLogin/signup now does AJAX checks for invalid and taken usernames,
  displaying the error live.
* Added BaseTemplateAfterPortlet hook to allow injecting html after portlets in skins.
* Support has been added for a JSON based localisation file format. The
  installer has been updated to use it.
* Changes to content typography (colors, line-height etc.). See
  https://www.mediawiki.org/wiki/Typography_refresh for further information.
* The Vector skin's visual treatment of external links has been simplified to a
  single icon (from nine). This should not affect local rules unless they were
  re-using these icons, which have now been deleted.
* ResourceLoader: mw.loader.using() now implements a Promise interface.
* Add new hook ChangesListInitRows accessed via ChangesList::initChangesListRows.
  If called by the ChangesList consumer this gives extensions a chance to batch
  process the result set prior to rendering.
* A PoolCounterRedis class was added which can be make use of in $wgPoolCounterConf.
  This requires at least one Redis 2.6+ server.
* $wgProfileToDatabase was removed. Set $wgProfiler to ProfilerSimpleDB
  in StartProfiler.php instead of using this.
* (bug 63444) Made it possible to change the indent string (default: 4 spaces)
  used by FormatJson::encode().

=== Bug fixes in 1.23 ===
* (bug 41759) The "updated since last visit" markers (on history pages, recent
  changes and watchlist) and the talk page message indicator are now correctly
  updated when the user is viewing old revisions of pages, instead of always
  acting as if the latest revision was being viewed.
* (bug 56443) Special:ConfirmEmail no longer shows a "Mail a confirmation code"
  when the email address is already confirmed. Also, consistently use
  "confirmed", rather than "authenticated", when messaging whether or not the
  user has confirmed an email address.
* (bug 19415) action=render no longer shows section edit links. This affects
  behavior of several other features where (bogus) section edit links will
  disappear, such as file description pages loaded via $wgUseInstantCommons or
  pages transcluded cross-wiki via $wgEnableScaryTranscluding.
* (bug 56912) Show correct link color on cached result of Special:DeadendPages.
* Classes TitleListDependency and TitleDependency have been removed, as they
  have been found unused in core and extensions for a long time.
* (bug 57098) SpecialPasswordReset now obeys returnto parameter
* (bug 37812) ResourceLoader will notice when a module's definition changes and
  recompile it accordingly.
* (bug 57201) SpecialRecentChangesFilters hook is now executed for feeds.
* (bug 58640) Fixed a compatibility issue with PCRE 8.34 that caused pages
  to appear blank or with missing text.
* (bug 56931) Updated the plural rules to CLDR 24. They are in new format
  which is detailed in UTS 35 Rev 33. The PHP parser and evaluator as well as
  the JavaScript evaluator were updated to support the new format. Plural rules
  for some languages have changed, most notably Russian. Affected software
  messages have been updated and marked for review at translatewiki.net.
* (bug 23542) imagelinks now stores both the redirect and target (as
  templatelinks does).
* (bug 58167) The web installer no longer throws an exception when PHP is
  compiled without support for MySQL yet with support for another DBMS.
* (bug 56199) Raw option of parser functions must now match complete word,
  to take effect.
* (bug 60543) Special:PrefixIndex forgot stripprefix=1 for "Next page" link
* (bug 29762) Undoing an already-undone edit will now display an appropriate
  message instead of leading the user to make a null edit.
* (bug 52659) mediawiki.notification: Notification area remained visible when
  empty and thus was stealing pointer events from links on the page.
* (bug 26811) When a DBUnexpectedError occurs, DB server hostnames are now
  hidden unless $wgShowExceptionDetails is true, and $wgShowDBErrorBacktrace
  no longer applies in such cases.
* (bug 60960) Avoid doing file_exist() checks on data: URIs, as they cause
  warnings to be printed on Windows due to large path length.
* (bug 48084) Fixed a bug in the installer that could cause $wgLogo to hold
  the wrong path to the placeholder logo (skins/common/images/wiki.png).
* (bug 64289) jquery.textSelection: Don't throw errors on empty collections.

=== Web API changes in 1.23 ===
* (bug 54884) action=parse&prop=categories now indicates hidden and missing
  categories.
* action=query&meta=filerepoinfo now returns additional information for each
  repo.
* action=parse&prop=languageshtml was deprecated in 1.18 and will be removed in
  MediaWiki 1.24.
* action=parse now has disabletoc flag to disable table of contents in output.
* (bug 25702) list=allcategories, list=allimages, list=alllinks, list=allpages,
  list=deletedrevs and list=filearchive did not handle case-sensitivity
  properly for all parameters.
* ApiQueryBase::titlePartToKey allows an extra parameter that indicates the
  namespace in order to properly capitalize the title part.
* (bug 57874) action=feedcontributions no longer has one item more than limit.
* All API modules now support an assert parameter. See the new features section
  for more details.
* Added prop=contributors to fetch the list of contributors to the page.
* The following API modules will now return entries where fields have been
  revision-deleted: list=deletedrevs, list=filearchive, list=recentchanges,
  list=watchlist. "hidden" indicators will be included, in the same style as is
  already done for prop=revisions.
* The following API modules will now return the content of revision-deleted
  fields, in addition to the "hidden" indicators, if the querying user has the
  necessary rights: list=logevents, list=usercontribs, prop=imageinfo,
  prop=revisions.
* The above modules, where applicable, will now return entries filtered by
  revision-deleted fields if the querying user has the necessary rights. For
  example, prop=revisions with rvuser or rvexcludeuser will no longer skip
  revisions where the user was revision-deleted if the current user has the
  deletedhistory right.
* The 'hideuser' right, used when blocking, is no longer necessary or
  sufficient for seeing contributions with revision-deleted in
  list=usercontribs.
* list=watchlist now uses the querying user's rights rather than the wlowner's
  rights when checking whether wlprop=patrol is allowed.
* (bug 32151) ApiWatch now has pageset capabilities (titles/pageids/generators).
  Title parameter is now deprecated.
* (bug 23005) Added action=revisiondelete.
* Added siprop=restrictions to API action=query&meta=siteinfo for querying
  possible page restriction (protection) levels and types.
* Added prop 'limitreportdata' and 'limitreporthtml' to action=parse.
* (bug 58627) Provide language names on action=parse&prop=langlinks.
* Deprecated llurl= in favour of llprop=url for action=query&prop=langlinks.
* Added llprop=langname and llprop=autonym for action=query&prop=langlinks.
* prop=redirects is added, to return redirects to the pages in the query.
* list=allredirects is added, to list all redirects pointing to a namespace.
* (bug 42026) Added ucshow={new,!new,top,!top} to list=usercontribs.
  Also added newonly to action=feedcontributions.
* (bug 42026) Deprecated uctoponly in favor of ucshow=top.
* list=search no longer has a "srredirects" parameter. Redirects are now
  included in all searches.
* Added list=prefixsearch that works like action=opensearch but can be used as
  a generator.
* (bug 24782) Various modules will now use unique continuation parameters.
* (bug 63249) Cache RecentChanges Atom feed in varnish for 15 seconds.

=== Languages updated in 1.23 ===

MediaWiki supports over 350 languages. Many localisations are updated
regularly. Below only new and removed languages are listed, as well as
changes to languages because of Bugzilla reports.

* Support was added for Algerian Spoken Arabic (arq).
* Support was added for Riograndenser Hunsrückisch (hrx).
* Support was added for Northern Luri (lrc).

=== Other changes in 1.23 ===
* The rc_type field in the recentchanges table has been superseded by a new
  rc_source field.  The rc_source field is a string representation of the
  change type where rc_type was a numeric constant.  This field is not yet
  queried but will be in a future release.
** Utilize update.php to create and populate this new field.  On larger wikis
   which do not wish to update recentchanges table in one large update please
   review the SQL and comments in maintenance/archives/patch-rc_source.sql.
** The rc_type field of recentchanges will be deprecated in a future release.
* The global variable $wgArticle has been removed after a lengthy deprecation.
* The global functions addButton and insertTags (for mw.toolbar.addButton and
  mw.toolbar.insertTags) now emits mw.log.warn when accessed.
* The ExpandTemplates extension has been moved into MediaWiki core.
* (bug 52812) Removed "Disable search suggestions" from Preference.
* (bug 52809) Removed "Disable browser page caching" from Preference.
* Three new modules intended for use by custom skins were added:
  'mediawiki.skinning.elements', 'mediawiki.skinning.content', and
  'mediawiki.skinning.interface', representing three levels of standard
  MediaWiki styling. Previously skin creators wishing to use them had to refer
  to the file names of appropriate files directly, which is now discouraged.
* The modules 'skins.vector' and 'skins.monobook' have been renamed to
  'skins.vector.styles' and 'skins.monobook.styles', respectively,
  and their definition was changed not to include the common*.css files;
  the two skins now load the 'mediawiki.skinning.interface' module instead.
* A page_links_updated field has been added to the page table.
* SpecialPage::getTitle has been deprecated in favor of
  SpecialPage::getPageTitle.
* BREAKING CHANGE: Two potentially backwards-incompatible changes have been made
  to the 'SpecialWatchlistQuery' hook's last parameter (array $values) to make
  the hook more consistent with the 'SpecialRecentChangesQuery' one:
** Several array keys have been renamed: hideMinor → hideminor,
   hideBots → hidebots, hideAnons → hideanons, hideLiu → hideliu,
   hidePatrolled → hidepatrolled, hideOwn → hidemyself.
** The parameter value is now a FormOptions object, not a plain array (array
   access operators should continue to work, as it implements the ArrayAccess
   interface).
* Option to mark hooks as deprecated has been added.
* (bug 52811) Preference "Enable section editing via [edit] links" was removed.
* (bug 52813) Preference "Show table of contents (for pages with more than
  3 headings)" was removed.
* (bug 52810) Preference "Justify paragraphs" was removed.
* OutputPage::showErrorPage raises a notice if arguments are incoherent.
* Thumbnails that keep failing to render in thumb.php will be rate-limited
  against further render attempts for 1 hour. $wgAttemptFailureEpoch can be
  altered to reset all rate-limited thumbnails at once.
* (bug 56572) Builds of the OOjs and OOjs UI libraries are now available.
* mw.loader.go and mw.loader.version have been removed.
* (bug 52815) Preference "Enable simplified search bar (Vector skin only)"
  was removed.
* A user_password_expires column has been added to the user table. The User
  object expects this column to exist. Use update.php to create this new field.
* The jquery.delayedBind ResourceLoader module was deprecated in favor of the
  jquery.throttle-debounce module. It will be removed in MediaWiki 1.24.
* mw.user.bucket has been deprecated.
* On Special:PrefixIndex, a table#mw-prefixindex-list-table was changed to
  table.mw-prefixindex-list-table to avoid duplicate ids when the special page
  is transcluded.
* (bug 62198) window.$j has been deprecated.
* Preference "Disable link title conversion" was removed.
* SpecialRecentChanges no longer includes any functionality for generating feeds
  - it has been factored out to ApiFeedRecentChanges. Old URLs redirect to new
  ones.
* RecentChange::mExtra['lang'] is no longer set and should no longer be used.
  Extensions should read from other configuration variables, including
  $wgLocalInterwikis, to identify the current wiki.
* Sections in the parser test framework have been renamed and the old
  section names are deprecated.  Please use "!!wikitext" and "!!html"
  (or "!!html/php") instead of "!!input" and "!!result".  This allows
  us to extend parser tests to accommodate additional input/output
  pairs, such as "!!html/parsoid" (for the output of the Parsoid
  parser, where it differs from the PHP parser).
* Special:Search no longer has an "include redirects" option on the advanced
  tab. Redirects are now included in all searches.
* mediawiki.api.category's getCategories() 'async' parameter was deprecated.
* The locations of resources have been split between upstream libraries, now in
  resources/lib/, local libaries in resources/src/, and local forks of upstream
  libraries, also in resources/src/.
* BREAKING CHANGE: The automatically-generated function closure with which
  ResourceLoader wraps all modules' JavaScript code now binds the identifier
  names 'jQuery' and '$' to the jQuery object of the version of jQuery that is
  bundled with MediaWiki. If you bind these names to other objects in global
  scope (like Zepto.js or document.querySelectorAll, for example) you will need
  to use different names to or re-bind them at the top of each
  ResourceLoader-loaded module.
* (bug 52342) Preference "Remember my login" was removed.
* The skin autodiscovery mechanism has been deprecated and will be removed in
  MediaWiki 1.25. See https://www.mediawiki.org/wiki/Manual:Skin_autodiscovery
  for migration guide for creators and users of custom skins that relied on it.

==== Removed classes ====
* FakeMemCachedClient (deprecated in 1.18)
* RdfMetaData (unused)
* TitleDependency (unused)
* TitleListDependency (unused)
* WikiError (deprecated in 1.17)
* WikiXmlError (deprecated in 1.17)
* WikiErrorMsg (deprecated in 1.17)

==== Renamed classes ====
* CdbReader_DBA to CdbReaderDBA
* CdbReader_PHP to CdbReaderPHP
* CdbWriter_DBA to CdbWriterDBA
* CdbWriter_PHP to CdbWriterPHP
* DiffOp_Add to DiffOpAdd
* DiffOp_Change to DiffOpChange
* DiffOp_Copy to DiffOpCopy
* DiffOp_Delete to DiffOpDelete
* HWLDF_WordAccumulator to HWLDFWordAccumulator
* LBFactory_Fake to LBFactoryFake
* LBFactory_Multi to LBFactoryMulti
* LBFactory_Simple to LBFactorySimple
* LBFactory_Single to LBFactorySingle
* LCStore_Accel to LCStoreAccel
* LCStore_CDB to LCStoreCDB
* LCStore_DB to LCStoreDB
* LCStore_Null to LCStoreNull
* LoadBalancer_Single to LoadBalancerSingle
* LoadMonitor_MySQL to LoadMonitorMySQL
* LoadMonitor_Null to LoadMonitorNull
* LocalisationCache_BulkLoad to LocalisationCacheBulkLoad
* csvStatsOutput to CsvStatsOutput
* extensionLanguages to ExtensionLanguages
* languages to Languages
* statsOutput to StatsOutput
* textStatsOutput to TextStatsOutput
* wikiStatsOutput to WikiStatsOutput

==== Removed methods ====
* ApiBase::getValidNamespaces() (deprecated in 1.17)
* ApiMain::setCachePrivate() (deprecated in 1.17)
* ApiMain::setVaryCookie (deprecated in 1.17)
* Article::doRedirect() (deprecated in 1.18)
* Article::doUnwatch() (deprecated in 1.18)
* Article::doWatch() (deprecated in 1.18)
* Article::forUpdate() (deprecated in 1.18)
* Article::markpatrolled() (deprecated in 1.18)
* Article::unwatch() (deprecated in 1.18)
* Article::watch() (deprecated in 1.18)
* Block::clear() (deprecated in 1.18)
* Block::decodeExpiry() (deprecated in 1.18)
* Block::encodeExpiry() (deprecated in 1.18)
* Block::forUpdate() (deprecated in 1.18)
* Block::infinity() (deprecated in 1.18)
* Block::load() (deprecated in 1.18)
* Block::newFromDB() (deprecated in 1.18)
* Block::normaliseRange() (deprecated in 1.18)
* Block::parseExpiryInput() (deprecated in 1.18)
* CategoryViewer::addSubcategory() (deprecated in 1.17)
* EditPage::spamPage() (deprecated since 1.17)
* Exif::getFormattedData() (deprecated in 1.18)
* Exif::makeFormattedData() (deprecated in 1.18)
* in_string (deprecated in 1.21)
* Language::convertLinkToAllVariants() (deprecated in 1.17)
* LanguageConverter::convertLinkToAllVariants() (deprecated in 1.17)
* Linker::makeBrokenLink() (deprecated in 1.16)
* Linker::makeBrokenLinkObj() (deprecated in 1.16)
* Linker::makeColouredLinkObj() (deprecated in 1.16)
* Linker::makeSizeLinkObj() (deprecated in 1.17)
* MediaWiki::articleFromTitle() (deprecated in 1.18)
* ParserOptions::getkin() (deprecated 1.18)
* ProfilerSimple::getCpuTime (deprecated in 1.20)
* Revision::revText() (deprecated in 1.17)
* SkinTemplate::jstext() (deprecated in 1.21)
* SpecialPage::__call() (deprecated in 1.17)
* SpecialPage::executePath() (deprecated in 1.18)
* SpecialPage::exists() (deprecated in 1.18)
* SpecialPage::file() (deprecated in 1.18)
* SpecialPage::func() (deprecated in 1.18)
* SpecialPage::getGroup() (deprecated in 1.18)
* SpecialPage::getPage() (deprecated in 1.18)
* SpecialPage::getPageByAlias() (deprecated in 1.18)
* SpecialPage::getLocalNameFor() (deprecated in 1.18)
* SpecialPage::getRegularPages() (deprecated in 1.18)
* SpecialPage::getRestrictedPages() (deprecated in 1.18)
* SpecialPage::getTitleForAlias() (deprecated in 1.18)
* SpecialPage::getUsablePages() (deprecated in 1.18)
* SpecialPage::includable() (deprecated in 1.18)
* SpecialPage::init()
* SpecialPage::initAliasList() (deprecated in 1.18)
* SpecialPage::initList() (deprecated in 1.18)
* SpecialPage::name() (deprecated in 1.18)
* SpecialPage::removePage() (deprecated in 1.18)
* SpecialPage::resolveAlias() (deprecated in 1.18)
* SpecialPage::resolveAliasWithSubpage() (deprecated in 1.18)
* SpecialPage::restriction() (deprecated in 1.18)
* SpecialPage::setGroup() (deprecated in 1.18)
* SpecialRecentChanges::feedSetup()
* SpecialRevisionDelete::extractBitField() (deprecated in 1.22)
* User::getPageRenderingHash() (deprecated in 1.17)
* WebRequest::getFileSize() (deprecated in 1.17)
* WebRequest::isPathInfoBad() (deprecated in 1.17)
* wfGenerateToken (deprecated in 1.20)
* wfStreamFile (deprecated in 1.19)
* wfUILang (deprecated in 1.18)
* WikiPage::createUpdates() (deprecated in 1.18)
* WikiPage::quickEdit() (deprecated in 1.18)
* WikiPage::useParserCache() (deprecated in 1.18)
* WikiPage::viewUpdates() (deprecated in 1.18)

==== Removed globals ====
* $wgBetterDirectionality (deprecated in 1.18)

== MediaWiki 1.22 ==


== MediaWiki 1.22.13 ==
This is a maintenance release of the MediaWiki 1.22 branch.

=== Changes since 1.22.12 ===
* (bug 67440) Allow classes to be registered properly from installer

== MediaWiki 1.22.12 ==
This is a security release of the MediaWiki 1.22 branch.

=== Changes since 1.22.11 ===
* (bug 70672) SECURITY: OutputPage: Remove separation of css and js module allowance.

== MediaWiki 1.22.11 ==
This is a security release of the MediaWiki 1.22 branch.

=== Changes since 1.22.10 ===
* (bug 69008) SECURITY: Enhance CSS filtering in SVG files. Filter <style> elements; normalize style elements and attributes before filtering; add checks for attributes that contain css; add unit tests for html5sec and reported bugs.

== MediaWiki 1.22.10 ==
This is a maintenance release of the MediaWiki 1.22 branch.

=== Changes since 1.22.9 ===
* (bug 64970) Fix support for blobs on DatabaseOracle::update
* (bug 60719) In MediaWiki 1.22, the job queue execution on each page request was changed (Gerrit change 59797) so, instead of executing the job inside the same PHP process that's rendering the page, a new PHP cli command is spawned to execute runJobs.php in the background. It will only work if $wgPhpCli is set to an actual path or safe mode is off, otherwise, the old method will be used. https://www.mediawiki.org/wiki/Manual:Job_queue#Changes_introduced_in_MediaWiki_1.22 for more infomation. This change was in earlier releases of 1.22 but was not noted here until now.

== MediaWiki 1.22.9 ==
This is a security and maintenance release of the MediaWiki 1.22 branch.

=== Changes since 1.22.8 ===
* (bug 68187) SECURITY: Prepend jsonp callback with comment.
* (bug 66608) SECURITY: Fix for XSS issue in bug 66608: Generate the URL used for loading a new page in Javascript,instead of relying on the URL in the link that has been clicked.
* (bug 65778) SECURITY: Copy prevent-clickjacking between OutputPage and ParserOutput.
* (bug 59147) The img_metadata field was not being decoded from bytea into text.

== MediaWiki 1.22.8 ==
This is a security and maintenance release of the MediaWiki 1.22 branch.

=== Changes since 1.22.7 ===
* (bug 65839) SECURITY: Prevent external resources in SVG files.
* (bug 66428) MimeMagic: Don't seek before BOF. This has weird side effects like only extracting the tail of the file partially or not at all.

== MediaWiki 1.22.7 ==
This is a security and maintenance release of the MediaWiki 1.22 branch.

=== Changes since 1.22.6 ===
* (bug 65501) SECURITY: Don't parse usernames as wikitext on Special:PasswordReset.
* (bug 36356) Add space between two feed links.
* (bug 63269) Email notifications were not correctly handling the MediaWiki:Helppage message being set to a full URL. This is a regression from the 1.22.5 point release, which made the default value for it a URL. If you customized MediaWiki:Enotif body (the text of email notifications), you'll need to edit it locally to include the URL via the new variable $HELPPAGE instead of the parser functions fullurl and canonicalurl; otherwise you don't have to do anything.
Add missing uploadstash.us_props for PostgreSQL.
* (bug 56047) Fixed stream wrapper in PhpHttpRequest.

== MediaWiki 1.22.6 ==
This is a security release of the MediaWiki 1.22 branch.

=== Changes since 1.22.5 ===
* (bug 63251) SECURITY: Escape sortKey in pageInfo.

== MediaWiki 1.22.5 ==
This is a security and maintenance release of the MediaWiki 1.22 branch.

=== Changes since 1.22.4 ===
* (bug 62497) SECURITY: Add CSRF token on Special:ChangePassword.
* (bug 62467) Set a title for the context during import on the cli.
* Fix custom local MediaWiki:Helppage values.
* mediawiki.js: Fix documentation breakage.
* (bug 58153) Make MySQLi work with non standard port.
* (bug 53887) Reintroduced a link to help pages in the default sidebar, that any sysop can customize by editing MediaWiki:Sidebar locally. The link now points to a mediawiki.org page which is guaranteed to exist. Nothing needs to be done on your end, but remember to adjust MediaWiki:Sidebar for the needs of your wikis. Everyone can help with the shared documentation by translating: https://www.mediawiki.org/wiki/Special:Translate/agg-Help_pages .
* (bug 53888) Corrected a regression in 1.22 which introduced red links on the login page. If you previously installed 1.22.x and have created a local page to make the red link blue, write its title as in MediaWiki:helplogin-url if you didn't already. Otherwise, you don't need to do anything, but you can translate the help page at https://www.mediawiki.org/wiki/Help:Logging_in .

== MediaWiki 1.22.4 ==
This is a maintenance release of the MediaWiki 1.22 branch.

=== Changes since 1.22.3 ===
* Use the correct branch of the extensions' git repositories.

== MediaWiki 1.22.3 ==
This is a security and bugfix release of the MediaWiki 1.22 branch.

=== Changes since 1.22.2 ===
* (bug 60771) SECURITY: Disallow uploading SVG files using non-whitelisted namespaces. Also disallow iframe elements. * User will get an error including the namespace name if they use a non- whitelisted namespace.
* (bug 61346) SECURITY: Make token comparison use constant time. It seems like our token comparison would be vulnerable to timing attacks. This will take constant time.
* (bug 61362) SECURITY: API: Don't find links in the middle of api.php links.
* (bug 53710) Add sequence support for upsert in DatabaseOracle in the same way as in selectInsert
* (bug 60231, bug 58719) Various fixes to job running code in Wiki.php: Make it async on Windows. Fixed possible "invalid filename" errors on Windows. Redirect output to dev/null to avoid hanging PHP.
* (bug 60083) Correct sequence name for fresh Postgres installation. Spotted by gebhkla
* (bug 60531) Avoid variable naming conflicts in DatabasePostgres::selectSQLText. Spotted by gebhkla
* (bug 60094) Fix rebuildall.php fatal error with PostgreSQL.
* (bug 43817) Add error handling if descriptionmsg isn't defined for extension.
* (bug 60543) Special:PrefixIndex omits stripprefix=1 for "Next page" link.

== MediaWiki 1.22.2 ==
This is a security and bugfix release of the MediaWiki 1.22 branch.

=== Changes since 1.22.1 ===
* (bug 60339) SECURITY: Sanitize shell arguments to DjVu files, and other media formats
* (bug 58253) Check for very old PCRE versions in installer and updater
* (bug 60054) Make WikiPage::$mPreparedEdit public

== MediaWiki 1.22.1 ==
This is a security and maintenance release of the MediaWiki 1.22 branch.

=== Changes since 1.22.0 ===
* (bug 57550) SECURITY: Disallow stylesheets in SVG Uploads
* (bug 58088) SECURITY: Don't normalize U+FF3C to \ in CSS Checks
* (bug 58472) SECURITY: Disallow -o-link in styles
* (bug 58553) SECURITY: Return error on invalid XML for SVG Uploads
* (bug 58699) SECURITY: Fix RevDel log entry information leaks
* (bug 58178) Restore compatibility with curl < 7.16.2.
* (bug 56931) Updated the plural rules to CLDR 24. They are in new format which is detailed in UTS 35 Rev 33. The PHP parser and evaluator as well as the JavaScript evaluator were updated to support the new format. Plural rules for some languages have changed, most notably Russian. Affected software messages have been updated and marked for review at translatewiki.net. This change is backported from the development branch of MediaWiki 1.23.
* (bug 58434) The broken installer for database backend Oracle was fixed.
* (bug 58167) The web installer no longer throws an exception when PHP is compiled without support for MySQL yet with support for another DBMS.
* (bug 58640) Fixed a compatibility issue with PCRE 8.34 that caused pages to appear blank or with missing text.
* (bug 47055) Changed FOR UPDATE handling in Postgresql
* (bug 57026) Avoid extra parsing in prepareContentForEdit()

=== Configuration changes in 1.22 ===
* $wgRedirectScript was removed. It was unused.
* Removed $wgLocalMessageCacheSerialized, it is now always true.
* $wgVectorUseIconWatch is now enabled by default.
* $wgCascadingRestrictionLevels was added.
* ftps, ssh, sftp, xmpp, sip, sips, tel, sms, bitcoin, magnet, urn, and geo
  have been whitelisted inside of $wgUrlProtocols.
* $wgDocType and $wgDTD have been removed and are no longer used for the DOCTYPE.
* $wgHtml5 is no longer used by core. Setting it to false will no longer disable HTML5.
  It is still set to true for extension compatibility but doing so in extensions is deprecated.
* $wgXhtmlDefaultNamespace is no longer used by core. Setting it will no longer change the
  xmlns used by MediaWiki. Reliance on this variable by extensions is deprecated.
* $wgHandheldStyle was removed.
* $wgHandheldForIPhone was removed.
* $wgJsMimeType is no longer used by core. Most usage has been removed since
  HTML output is now exclusively HTML5.
* $wgDBOracleDRCP added. True enables persistent connection with DRCP on Oracle.
* $wgLogAutopatrol added to allow disabling logging of autopatrol edits in the logging table.
  Default for $wgLogAutopatrol is true.
* The 'edit' right no longer allows for editing a user's own CSS and JS.
* New rights 'editmyusercss', 'editmyuserjs', 'viewmywatchlist',
  'editmywatchlist', 'viewmyprivateinfo', 'editmyprivateinfo', and
  'editmyoptions' restrict actions that were formerly allowed by default. They
  have been added to the default for $wgGroupPermissions['*'].
* The 'editprotected' right no longer allows bypassing of all page protection
  restrictions. Any group using it for this purpose will now need to have all
  the individual rights listed in $wgRestrictionTypes for the same effect.
* The 'protect' and 'autoconfirmed' rights are no longer used for the default
  page protection levels. The rights 'editprotected' and 'editsemiprotected'
  are now used for this purpose instead.
* (bug 40866) wgOldChangeTagsIndex removed.
* $wgNoFollowDomainExceptions now only matches entire domains. For example,
  an entry for 'bar.com' will still match 'foo.bar.com' but not 'foobar.com'.
* $wgCopyUploadTimeout and $wgCopyUploadAsyncTimeout added to change the timeout times for
  fetching the file during upload by url.
* New key added to $wgGalleryOptions - $wgGalleryOptions['mode'] to set
  default gallery mode.
* New hook 'GalleryGetModes' to allow extensions to make new gallery modes.
* The checkbox for staying in HTTPS displayed on the login form when $wgSecureLogin is
  enabled has been removed. Instead, whether the user stays in HTTPS will be determined
  based on the user's preferences, and whether they came from HTTPS or not.
* $wgRC2UDPAddress, $wgRC2UDPInterwikiPrefix, $wgRC2UDPOmitBots, $wgRC2UDPPort,
  and $wgRC2UDPPrefix configuration options have been deprecated in favor of a
  $wgRCFeeds configuration array. $wgRCFeeds makes both the format and
  destination of recent change notifications customizable, and allows for
  multiple destinations to be specified.
* (bug 53862) portal-url, currentevents-url and helppage have been removed from the
  default Sidebar.
* The 'vector-simplesearch' preference is now enabled by default. Previously
  it was only enabled if the Vector extension was installed.
* The precise format of metric datagrams produced by the UDP profiler and stats counter
  may now be specified as $wgUDPProfilerFormatString and $wgStatsFormatString,
  respectively.
* (bug 54597) $wgBlockOpenProxies, $wgProxyPorts, $wgProxyScriptPath, and
  $wgProxyMemcExpiry have been removed, along with the open proxy scanner
  script they were added for.
* Default value of $wgMaxShellMemory has been tripled (it's now 300 MB).

=== New features in 1.22 ===
* You can now install extensions using Composer.
  See https://www.mediawiki.org/wiki/Composer
* (bug 44525) mediawiki.jqueryMsg can now parse (whitelisted) HTML elements and attributes.
* (bug 33454) Language::sprintfDate now has a timezone parameter, and supports
  the "eIOPTZ" formatting characters.
* EditWarning: A warning is shown when an editor leaves the edit form without
  saving (enabled by default, users can opt-out via the 'useeditwarning'
  preference). This feature was moved from the Vector extension, and is now part
  of core for all skins. Take care when upgrading that you don't use an older
  version of the Vector extension as this feature may conflict.
* New 'mediawiki.ui' CSS module providing mw-ui-* styles for buttons and a
  compact vertical form layout.
* HTMLForm supports a new display format 'vform' which applies this compact vertical
  layout and button styling. Special:PasswordReset uses this format.
* New versions of login (Special:UserLogin) and create account
  (Special:UserLogin/signup) forms using the "vform" compact vertical form layout.
  These forms use new messages that assume a "Help logging in" link, see
  https://www.mediawiki.org/wiki/Manual:Page_customizations;
  https://www.mediawiki.org/wiki/Account_creation_user_experience/Strings lists the
  message key changes.
* (bug 23343) Implemented ability to apply IP blocks to the contents of X-Forwarded-For headers
  by adding a new configuration variable $wgApplyIpBlocksToXff (disabled by default).
* The new hook 'APIGetPossibleErrors' to modify the list of possible errors was
  added.
* (bug 25592) LogEventsList::showLogExtract() will now ignore various
  Pager-related WebRequest parameters by default, as this is overwhelmingly
  likely to be what was intended by users of the method. If any caller wishes
  to use these parameters, the new param 'useRequestParams' may be set to true.
* mw.util.addPortletLink: Tooltip is no longer required to be plain (without
  an accesskey in it already). As such it now rountrips. Creating a link with a
  message as tooltip, grabbing the title attribute and using it to create
  another portlet will work as expected.
* (bug 6747) {{ROOTPAGENAME}} introduced, contains the name of the topmost
  page without namespace.
* BREAKING CHANGE: (bug 41729) Display editsection links next to headings. Also
  change their class name from .editsection to .mw-editsection and place them at
  the end of the heading element instead of the beginning. Client-side code and
  screen-scrapers will have to be adjusted to handle both cases (old HTML will
  still be visible on cached page renders until they are purged); extensions
  using the DoEditSectionLink or EditSectionLink hooks might need adjustments as
  well.
* (bug 45535) introduced the new 'LanguageLinks' hook for manipulating the
  language links associated with a page before display.
* Chosen (http://harvesthq.github.io/chosen/) was added as module 'jquery.chosen'
* HTMLForm will turn multiselect checkboxes into a Chosen interface when setting cssclass 'mw-chosen'
* rebuildLocalisationCache learned --lang option. Let you rebuild l10n caches
  of the specified languages instead of all of them.
* New GetNewMessagesAlert hook allowing extensions to disable or modify the new
  messages alert
* New wgUserNewMsgRevisionId JS global for logged in users. This will be null
  if the user has no new talk page messages. Otherwise it will be set to the
  revision ID of the oldest new talk page message. This will allow gadgets and
  extensions to create their own new message alerts on the client side.
* mediawiki.log: Added log.warn wrapper (uses console.warn and console.trace).
* mediawiki.log: Implemented log.deprecate. This method defines a property and
  uses ES5 getter/setter to emit a warning when they are used.
* $wgCascadingRestrictionLevels was added, allowing one to specify restriction levels
  which can be cascading (previously 'sysop' was hard-coded as the only one).
* XHTML5 support has been improved. If you set $wgMimeType = 'application/xhtml+xml'
  MediaWiki will try outputting markup according to XHTML5 rules.
* Altered hook 'ProtectionForm::save', adding the reason page protection is
  changed as third parameter.
* New hook 'TitleSquidURLs' for manipulating the list of URLs to be purged from
  HTTP caches when a page is changed.
* Changed the patrolling system to always show the link for patrolling in case the
  current revision is patrollable. This also removed the usage of the rcid URI parameters.
* Oracle DB backend now supports Database Resident Connection Pooling (DRCP).
  Can be enabled by setting $wgDBOracleDRCP=true.
  Requires Oracle DB 11gR1 or above, enabled DRCP inside the DB itself and a
  propper connect string.
  More about DRCP can be found at:
  http://www.oracle-base.com/articles/11g/database-resident-connection-pool-11gr1.php
* Add a new parameter $patrolFooterShown to hook ArticleViewFooter so the hook
  handlers can take further action based on the status of the patrol footer
* A new hook TitleQuickPermissions was added to allow overriding of quick
  permissions in the Title class.
* LinkCache singleton can now be altered or cleared, letting one to specify
  another instance that does not rely on a database backend.
* MediaWiki's PHPUnit tests can now use PHPUnit installed using composer --dev.
* (bug 43689) The lists of templates used on the page and hidden categories it
  is a member of, shown below the edit form, are now collapsible (and collapsed
  by default).
* Parser profiling data, formerly only available in the "NewPP limit report"
  HTML comment, is now also displayed at the bottom of page previews.
* Added ParserLimitReportPrepare and ParserLimitReportFormat hooks, deprecated
  ParserLimitReport hook.
* New user rights have been added to increase granularity in rights management
  for extensions such as OAuth:
** editmyusercss controls whether a user may edit their own CSS subpages.
** editmyuserjs controls whether a user may edit their own JS subpages.
** viewmywatchlist controls whether a user may view their watchlist.
** editmywatchlist controls whether a user may edit their watchlist.
** viewmyprivateinfo controls whether a user may access their private
   information (e.g. registered email address, real name).
** editmyprivateinfo controls whether a user may change their private
   information.
** editmyoptions controls whether a user may change their preferences.
* Add new hook AbortTalkPageEmailNotification, this will be used to determine
  whether to send the regular talk page email notification
* Action classes registered in $wgActions are now also supported in the form of
  a callback (which returns an instance of Action) instead of providing the name
  of a subclass of Action.
* (bug 46513) Vector: Add the collapsibleTabs script from the Vector extension.
* Added $wgRecentChangesFlags for defining new flags for RecentChanges and
  watchlists.
* (bug 40518) mw.toolbar: Implemented mw.toolbar.addButtons for adding multiple
 button objects in one call.
* Rights used for the default protection levels ('sysop' and 'autoconfirmed')
  are now used just for that purpose, instead of overloading other rights. This
  allows easy granting of the ability to edit sysop-protected pages without
  also granting the ability to protect and unprotect.
* (bug 48256) Make brackets in section edit links accessible to CSS.
  They are now wrapped in <span class="mw-editsection-bracket" />.
* (bug 8480) Allow handler specific parameters in galleries (like page number)
* jquery.client: Add detection for Opera 15 and Internet Explorer 11.
* Change tags (used by the AbuseFilter extension) are now shown on diff pages.
* Change tag lists (shown on recent changes, watchlist, user contributions,
  history pages, diff pages) now include a link to Special:Tags to distinguish
  them from edit summaries.
* Added a new method and hook, User::isEveryoneAllowed() and
  UserIsEveryoneAllowed, for use in situations where a "does everyone have this
  right?" check is used to avoid more expensive checks.
* (bug 14431) Display "(No difference)" instead of an empty diff (when comparing
  revisions in the history or when previewing changes while editing).
* New hook 'IsUploadAllowedFromUrl' is added which can be used to intercept uploads by
  URL, useful for blacklisting specific URLs
* (bug 21912) Watchlist token implementation has been refactored and
  Special:ResetTokens was added to allow users to reset their tokens
  instead of presenting them in Preferences.
* Special:PrefixIndex now lets you strip the searched prefix from the displayed
  titles. Given a list of articles named Bug1, Bug2, you can now transclude the
  list of bug numbers using: {{Special:PrefixIndex/Bug|stripprefix=1}}.
  The special page form received a new checkbox matching that option.
* (bug 23580) Implement javascript callback interface "mw.hook".
* (bug 30713) New mw.hook "wikipage.content".
* (bug 40430) jquery.placeholder gets a new parameter to set the attribute value
  to be used.
* $wgHTCPMulticastRouting renamed $wgHTCPRouting since it accepts unicast.
* $wgHTCPRouting rules can now be passed an array of hosts/ports to send purge
  too. Can be used whenever several multicast group could be interested by a
  specific purge.
* (bug 25931) Add Special:RandomInCategory.
* mediawiki.util: addPortletLink now supports passing a jQuery object as nextnode.
* <wbr> can now be used inside WikiText.
* WebResponse::setcookie is much more featureful. Callers using PHP's
  setcookie() or setrawcookie() should begin using this instead.
* New hook WebResponseSetCookie, called from WebResponse::setcookie().
* New hook ResetSessionID, called when the session id is reset.
* Add a mode parameter to <gallery> tag with potential options of "traditional",
  "nolines", "packed", "packed-overlay", or "packed-hover".
* (bug 47399) A success message is now displayed after changing the password.
* Make thumb.php give HTTP redirects for file redirects
* (bug 30607) Special:ListFiles can now show old versions of files. Additionally
  Special:AllMyUploads was introduced so the user can get a list of all things
  they have ever uploaded, even if it was subsequently overridden.
* Introduced Special:MyFiles and Special:AllMyFiles as an alias for Special:MyUploads
  and Special:AllMyUploads respectively.
* IPv6 addresses in X-Forwarded-For headers are now normalised before checking
  against allowed proxy lists.
* Add deferrable update support for callback/closure.
* Add TitleMove hook before page renames.
* Revision deletion backend code is moved out of SpecialRevisiondelete
* Added {{REVISIONSIZE}} variable to get the current size of a revision.
* Add support for the LESS stylesheet language to ResourceLoader. LESS is a
  stylesheet language that compiles into CSS. ResourceLoader file modules may
  include LESS style files; ResourceLoader will compile these files into CSS
  before sending them to the client.
** The $wgResourceLoaderLESSVars configuration variable is an associative array
   mapping variable names to string CSS values. These variables are considered
   declared for all LESS files. Additional variables may be registered by
   adding keys to the array.
** $wgResourceLoaderLESSFunctions is an associative array of custom LESS
   function names to PHP callables. See <http://leafo.net/lessphp/docs/#custom_functions>
   for more details regarding custom functions.
** $wgResourceLoaderLESSImportPaths is an array of file system paths. Files
   referenced in LESS '@import' statements are looked up here first.
* ResourceLoader supports hashes as module cache invalidation trigger (instead
  of or in addition to timestamps).
* Added $wgExtensionEntryPointListFiles for use in mergeMessageFileList.php.
* Added a hook, APIQuerySiteInfoStatisticsInfo, to allow extensions to modify
  the output of the API query meta=siteinfo&siprop=statistics
* Primary keys have been added to both the archive table and the externallinks
  tables.
* Added $wgEnableParserLimitReporting to control whether the NewPP limit report is
  output in a HTML comment.
* The 'UnwatchArticle' and 'WatchArticle' hooks now support a Status object
  instead of just a boolean return value to abort the hook.
* Added a hook, SpecialWatchlistGetNonRevisionTypes, to allow extensions
  with custom recentchanges entries to hook into the Watchlist without
  clobbering each other.
* A hidden, empty input field was added to the edit form, and any edit that fills
  it in will be rejected. This prevents against the simplest form of spambots.
  Previously in the "SimpleAntiSpam" extension by Ryan Schmidt.
* populateRevisionLength.php maintenance script updated to also populate
  archive.ar_len field.
* (bug 43571) DatabaseMySQLBase learned to list views, optionally filtered by a
  prefix. Also fixed PHPUnit test suite when using a MySQL backend containing
  views.

=== Bug fixes in 1.22 ===
* (bug 47271) $wgContentHandlerUseDB should be set to false during the upgrade
* Disable Special:PasswordReset when $wgEnableEmail is false. Previously one
  could still navigate to the page by entering the URL directly.
* (bug 47138) Fixed a fatal error when a blocked user tries to automatically
  create an account on login due external authentication in some circumstances.
* (bug 23393) HTML <hN> headings containing line breaks are now handled
  correctly.
* (bug 45803) Whitespace within == Headline == syntax and within <hN> headings
  is now non-significant and not preserved in the HTML output.
* (bug 47218) Special:BlockList now handles correctly user names with spaces
  when passed as subpage.
* Pager's properly validate which fields are allowed to be sorted on.
* mw.util.tooltipAccessKeyRegexp: The regex now matches "option-" as well.
  Support for Mac "option" was added in 1.16, but the regex was never updated.
* (bug 46768) Usernames of blocking users now display correctly, even if numeric.
* (bug 39590) Self-transclusions now show the most up to date result always
  after save instead of being a revision behind.
* A bias in wfRandomString() toward digits 1-7 has been corrected. Generated
  strings will now start with digits 0 and 8-f as often as they should.
* (bug 45371) Removed Parser_LinkHooks and CoreLinkFunctions classes.
* (bug 41545) Allow <kbd>, <samp>, and <var> to be nested like allowed in html.
* PLURAL magic word no longer causes a PHP notice when no matching form exists.
* (bug 36641) Patrol page links no longer show on non-existent revisions.
* (bug 35810) Pages not linked from Special:RecentChanges or Special:NewPages
  are patrollable now.
* (bug 30213) JavaScript for search suggestions is now disabled when the API
  is disabled, and AJAX patrolling and watching are now disabled when use of
  the write API is not allowed.
* (bug 48294) API: Fix chunk upload async mode.
* (bug 46749) Broken files tracking category removed from pages if an image
  with that name is uploaded.
* (bug 14176) System messages that are empty were previously incorrectly treated
  as non-existent, causing a fallback to the default. This stopped users from
  overriding system messages to make them blank.
* (bug 48319) action=parse no longer returns an error if passed none of 'oldid',
  'pageid', 'page', 'title', and 'text' (e.g. if only passed 'summary'). A
  warning will instead be issued if 'title' is non-default, unless no props are
  requested.
* Special:Recentchangeslinked will now include upload log entries
* (bug 41281) Fixed ugly output if file size could not be extracted for multi-page media.
* (bug 50315) list=logevents API module will now output log entries by anonymous users.
* (bug 38911) Handle headers with rowspan in jquery.tablesorter
* (bug 658) Converted the table of contents on wiki pages from <table> to <div>
  and adjusted skin CSS accordingly. The CSS was carefully crafted to be
  backwards-compatible in all reasonable cases (uses of the __TOC__ magic word,
  the #toc CSS id and the .toc CSS class). However, particularly bad abuse of
  the id or the class can possibly break.
* CSSJanus now supports rgb, hsl, rgba, and hsla color syntaxes.
* Special:Listfiles can no longer be sorted by image name when filtering
  by user in miser mode.
* (bug 49074) CSSJanus: Handle values of border-radius correctly.
* Handle relative inclusions ({{../name}}) in main namespace with subpages
  enabled correctly (previously MediaWiki tried to include Template:Parent/name
  instead of just Parent/name).
* Added $wgAPIUselessQueryPages to allow extensions to flag their query pages
  for non-inclusion in ApiQueryQueryPages.
* (bug 50870) mediawiki.notification: Notification area should remain visible
  when scrolled down.
* (bug 13438) Special:MIMESearch no longer an expensive special page.
* (bug 48342) Fixed a fatal error when $wgValidateAllHtml is set to true and
  the function apache_request_headers() function is not available.
* (bug 33399) LivePreview: Re-run wikipage content handlers
  (jquery.makeCollapsible, jquery.tablesorter) after preview content is loaded.
* (bug 51891) Fixed PHP notice on Special:PagesWithProp when no properties
  are defined.
* (bug 52006) Corrected documentation of $wgTranscludeCacheExpiry.
* (bug 52077) The APIEditBeforeSave hook is giving the content of the whole
  revision as second argument now, rather than just the current section.
* (bug 49694) $wgSpamRegex is now also applied on the new section headline text
  adding a new topic on a page
* (bug 41756) Improve treatment of multiple comments on a blank line.
* (bug 51064) Purge upstream caches when deleting file assets.
* (bug 39012) File types with a mime that we do not know the extension for
  can no longer be uploaded as an extension that we do know the mime type
  for.
* (bug 51742) Add data-sort-value for better sorting of hitcounts Special:Tags
* (bug 26811) On DB error pages, server hostnames are now hidden when both
  $wgShowHostnames and $wgShowSQLErrors are false.
* (bug 6200) line breaks in <blockquote> are handled like they are in <div>
* (bug 14931) Default character set now set to 'utf8' when a new MySQL
  database is created.
* (bug 47191) Fixed "Column 'si_title' cannot be part of FULLTEXT index"
  MySQL error when installing using the binary character set option.
* (bug 45288) Support mysqli PHP extension
* (bug 55818) BREAKING CHANGE: Removed undocumented 'Debug' hook in wfDebug.
  This resolves an infinite loop when using $wgDebugFunctionEntry = true.
* (bug 56707) Correct tooltip of "Next n results" on query special pages.
* (bug 56770) mw.util.addPortletLink: Check length before access array index.

=== API changes in 1.22 ===
* (bug 25553) The JSON output formatter now leaves forward slashes unescaped
  to improve human readability of URLs and similar strings. Also, a "utf8"
  option is now provided to use UTF-8 encoding instead of hex escape codes
  for most non-ASCII characters.
* (bug 46626) xmldoublequote parameter was removed. Because of a bug, the
  parameter has had no effect since MediaWiki 1.16, and so its removal is
  unlikely to impact existing clients.
* (bug 47216) action=query&meta=siteinfo&siprop=skins will now indicate which
  skin is the default and which are unusable (e.g. listed in $wgSkipSkins).
* (bug 25325) Added support for wlshow filtering (bots/anon/minor/patrolled)
  to action=feedwatchlist.
* WDDX formatted output will actually be formatted (and normal output will no
  longer be), and will no longer choke on booleans.
* action=opensearch no longer silently ignores the format parameter.
* action=opensearch now supports format=jsonfm.
* list=usercontribs&ucprop=ids will now include the parent revision id.
* BREAKING CHANGE: action=parse no longer returns all langlinks for the page
  with prop=langlinks by default. The new effectivelanglinks parameter will
  request that the LanguageLinks hook be called to determine the effective
  language links.
* BREAKING CHANGE: list=allpages, list=langbacklinks, and prop=langlinks do not
  apply the new LanguageLinks hook, and thus only consider language links
  stored in the database.
* (bug 47219) Allow specifying change type of Wikipedia feed items
* prop=imageinfo now allows setting iiurlheight without setting iiurlwidth
* prop=info now adds the content model and page language of the title.
* New upload log entries will now contain information on the relevant
  image (sha1 and timestamp).
* (bug 49239) action=parse now can parse in preview and section preview modes.
* (bug 49259) action=patrol now accepts revision ids.
* (bug 48129) list=blocks&bkip= now correctly handles IPv6 CIDR ranges and
  honors $wgBlockCIDRLimit. Note any clients passing invalid values to bkip
  will now receive an error, rather than the previous behavior listing all
  user blocks.
* (bug 48201) action=parse&text=foo now assumes wikitext if no title is given,
  rather than using the content model of the page "API".
* action=watch no longer silently ignores hook abort.
* (bug 50785) action=purge with forcelinkupdate=1 no longer queues refreshLinks
  jobs in the job queue for link table updates of pages that use the given page
  as a template. Instead, forcerecursivelinkupdate=1 is introduced and should
  be used if that behaviour is desirable.
* The 'debugLog' property (enabled by $wgDebugToolbar) no longer sets the log
  entry values through ApiResult::content but directly. This changes the JSON
  output from an array of objects with content in '*' to an array of strings
  with the content.
* (bug 51342) prop=imageinfo iicontinue now contains the dbkey, not the text
  version of the title.
* (bug 52538) action=edit will now use empty text instead of the contents
  of section 0 when passed prependtext or appendtext with section=new.
* Support for the 'gettoken' parameter to action=block and action=unblock,
  deprecated since 1.20, has been removed.
* (bug 49090) Token-getting functions will fail when using jsonp callbacks.
* (bug 52699) action=upload returns normalized file name on warning
  "exists-normalized" instead of filename to be uploaded to.
* (bug 53884) action=edit will now return an error when the specified section
  does not exist in the page.
* Added meta=filerepoinfo API module for getting information about foreign
  file repositories, and related ForeignAPIRepo methods getInfo and getApiUrl.
* The new query module list=allfileusages to enumerate file usages was added.

=== Languages updated in 1.22===

MediaWiki supports over 350 languages. Many localisations are updated
regularly. Below only new and removed languages are listed, as well as
changes to languages because of Bugzilla reports.

* Batak Toba (bbc-latn) added.
* (bug 46751) Made Buryat (Russia) (буряад) (bxr) fallback to Russian.

=== Other changes in 1.22 ===
* BREAKING CHANGE: Implementation of MediaWiki's JS and JSON value encoding
  has changed:
** MediaWiki no longer supports PHP installations in which the native JSON
   extension is missing or disabled.
** XmlJsCode objects can no longer be nested inside objects or arrays.
   (For Xml::encodeJsCall(), this individually applies to each argument.)
** The sets of characters escaped by default, along with the precise escape
   sequences used, have changed (except for the Xml::escapeJsString()
   function, which is now deprecated).
* BREAKING CHANGE: The Services_JSON class has been removed. If necessary,
  be sure to upgrade affected extensions at the same time (e.g. Collection).
* redirect.php was removed. It was unused.
* ClickTracking integration was dropped from the mediaWiki.user.bucket
  JavaScript function. The 'tracked' option is now ignored.
* BREAKING CHANGE: Legacy skins Simple, MySkin, Chick, Standard and Nostalgia
  were all removed. (Nostalgia was moved to an extension.) The SkinLegacy and
  LegacyTemplate classes that supported them were removed as well and are now a
  part of the Nostalgia extension.
* Event namespace used by jquery.makeCollapsible has been changed from
  'mw-collapse' to 'mw-collapsible' for consistency with the module name.
* BREAKING CHANGE: The "ExternalAuth" authentication subsystem was removed, along
  with its associated globals of $wgExternalAuthType, $wgExternalAuthConf,
  $wgAutocreatePolicy and $wgAllowPrefChange. Affected users are encouraged to
  use AuthPlugin for external authentication/authorization needs.
* The Quickbar feature of the legacy skin model and the last remnants of it
  throughout the code base have been removed.
* Externaledit/externaldiff preference was removed. Very few users used this
  feature, and improper configuration can actually prevent a user from editing
* Calling Linker methods using a skin will now output deprecation warnings.
* (bug 46680) "Return to" links are no longer tagged with rel="next".
* BREAKING CHANGE: mw.util.tooltipAccessKeyRegexp: The match group for the
  accesskey character is now $6 instead of $5.
* HipHop compiler (hphpc) support was removed. HipHop VM support (hhvm) was
  added.
* A new Special:Redirect page was added, providing lookup by revision ID,
  user ID, or file name.  The old Special:Filepath page was reimplemented
  to redirect through Special:Redirect.
* Monobook: Removed the old conditional stylesheets for Opera 6, 7 and 9.
* Support for XHTML 1.0 has been removed. MediaWiki now only outputs (X)HTML5.
* wikibits: User-agent related globals have been deprecated. The following
  properties now default to false and emit mw.log.warn: is_gecko, is_chrome_mac,
  is_chrome, webkit_version, is_safari_win, is_safari, webkit_match, is_ff2,
  ff2_bugs, is_ff2_win, is_ff2_x11, opera95_bugs, opera7_bugs, opera6_bugs,
  is_opera_95, is_opera_preseven, is_opera, and ie6_bugs.
* (bug 48276) MediaWiki will now flash a confirmation message upon successfully
  editing a page.
* (bug 40785) mediawiki.legacy.ajax has been marked as deprecated. The following
  properties now emit mw.log.warn when accessed: sajax_debug, sajax_init_object,
  sajax_do_call and wfSupportsAjax.
* BREAKING CHANGE: meta keywords are no longer supported. A <meta name="keywords"
  will no longer be output and OutputPage::addKeyword no longer exists.
* Methods Title::userCanEditCssSubpage and Title::userCanEditJsSubpage,
  deprecated since 1.19, have been removed.
* (bug 50134) Hook functions are no longer required to return a value. When a
  hook function does not return a value (or when it returns an explicit null),
  processing continues. To abort the hook, a hook function must return an
  explicit, boolean false or a string error message. Other falsey values are
  tantamount to a 'return true' in earlier versions of MediaWiki.
* BREAKING CHANGE: The EditSectionLink hook was removed after being
  deprecated since MediaWiki 1.14. Use DoEditSectionLink instead.
* (bug 48256) The 'editsection-brackets' optional message was removed.
  Section edit links' brackets can now be customized using CSS by
  styling span.mw-editsection-bracket.
* The usePatrol function in ChangesList has been marked as deprecated.
* (bug 50785) A "null edit", that is, a save action in which no changes to the
  page text are made and no revision recorded, will no longer send refreshLinks
  jobs to the job table to update pages which use the edited page as a template.
* The LivePreviewPrepare and LivePreviewDone events triggered on "jQuery( mw )"
  have been deprecated in favour of using mw.hook.
* The 'showjumplinks' user preference has been removed, jump links are now
  always included.
* Methods RecentChange::notifyRC2UDP, RecentChange::sendToUDP, and
  RecentChange::cleanupForIRC have been deprecated, as it is now the
  responsibility of classes implementing the RCFeedFormatter and RCFeedEngine
  interfaces to implement the formatting and delivery for recent change
  notifications.
* SpecialPrefixindex methods namespacePrefixForm() and showPrefixChunk() have
  been made protected. They were accepting form variance arguments, this is now
  using properties in the SpecialPrefixindex class.
* (bug 50310) BREAKING CHANGE: wikibits: Drop support for mwCustomEditButtons.
  It defaults to an empty array and emits mw.log.warn when accessed.
* BREAKING CHANGE: Special:Disambiguations has been removed from MediaWiki core.
  Functions related to disambiguation pages are now handled by the Disambiguator
  extension (https://www.mediawiki.org/wiki/Extension:Disambiguator) (bug
  35981).
* BREAKING CHANGE: The 'mediawiki.legacy.wikiprintable' module has been removed.
  The skins/common/wikiprintable.css file no longer exists. Return value of
  Skin#commonPrintStylesheet is ignored. Please use the 'mediawiki.legacy.commonPrint'
  module instead or base your skin on SkinTemplate.
* (bug 49629) The hook ExtractThumbParameters has been deprecated in favour
  of media handler overriding MediaHandler::parseParamString.
* (bug 46512) The collapsibleNav feature from the Vector extension has been moved
  to the Vector skin in core.
* SpecialRecentChanges::addRecentChangesJS() function has been renamed
  to addModules() and made protected.
* Methods WatchAction::doWatch and WatchAction::doUnwatch now return a Status
  object instead of a boolean.
* Information boxes (CSS classes errorbox, warningbox, successbox) have been
  made more subtle.
* BREAKING CHANGE: The module 'mediawiki.legacy.IEFixes' has been removed as it was
  unused. The file skins/common/IEFixes.js remains but is only used by wikibits.
  The file never contained any re-usable components. To use it in a skin, load
  'mediawiki.legacy.wikibits' (which IEFixes depends on) and that will import
  IEFixes automatically if user agent conditions are met.
* Code specific to the Math extension was marked as deprecated.
* mediawiki.util: mw.util.wikiGetlink has been renamed to getUrl. (The old name
  still works, but is deprecated.)

== MediaWiki 1.21 ==

== MediaWiki 1.21.11 ==
This is a security and maintenance release of the MediaWiki 1.21 branch.

=== Changes since 1.21.10 ===
* (bug 65839) SECURITY: Prevent external resources in SVG files.
* (bug 66428) MimeMagic: Don't seek before BOF. This has weird side effects like only extracting the tail of the file partially or not at all.

== MediaWiki 1.21.10 ==
This is a security and maintenance release of the MediaWiki 1.21 branch.

=== Changes since 1.21.9 ===
* (bug 65501) SECURITY: Don't parse usernames as wikitext on Special:PasswordReset.
* (bug 36356) Add space between two feed links.

== MediaWiki 1.21.9 ==
This is a security and maintenance release of the MediaWiki 1.21 branch.

=== Changes since 1.21.8 ===
* (bug 63251) SECURITY: Escape sortKey in pageInfo.
* (bug 58640) Fixed a compatibility issue with PCRE 8.34 that caused pages to appear blank or with missing text.

== MediaWiki 1.21.8 ==
This is a security and maintenance release of the MediaWiki 1.21 branch.

=== Changes since 1.21.7 ===
* (bug 62497) SECURITY: Add CSRF token on Special:ChangePassword.
* (bug 62467) Set a title for the context during import on the cli.

== MediaWiki 1.21.7 ==
This is a maintenance release of the MediaWiki 1.21 branch.

=== Changes since 1.21.6 ===
* Use the correct branch of the extensions' git repositories.

== MediaWiki 1.21.6 ==
This is a security release of the MediaWiki 1.21 branch.

=== Changes since 1.21.5 ===
* (bug 60771) SECURITY: Disallow uploading SVG files using non-whitelisted namespaces. Also disallow iframe elements. * User will get an error including the namespace name if they use a non- whitelisted namespace.
* (bug 61346) SECURITY: Make token comparison use constant time. It seems like our token comparison would be vulnerable to timing attacks. This will take constant time.
* (bug 61362) SECURITY: API: Don't find links in the middle of api.php links.

== MediaWiki 1.21.5 ==
This is a security release of the MediaWiki 1.21 branch.

=== Changes since 1.21.4 ===
* (bug 60339) SECURITY: Sanitize shell arguments to DjVu files, and other media formats

== MediaWiki 1.21.4 ==
This is a security release of the MediaWiki 1.21 branch.

=== Changes since 1.21.3 ===
* (bug 57550) SECURITY: Disallow stylesheets in SVG Uploads
* (bug 58088) SECURITY: Don't normalize U+FF3C to \ in CSS Checks
* (bug 58472) SECURITY: Disallow -o-link in styles
* (bug 58553) SECURITY: Return error on invalid XML for SVG Uploads
* (bug 58699) SECURITY: Fix RevDel log entry information leaks

== MediaWiki 1.21.3 ==
This is a security and maintenance release of the MediaWiki 1.21 branch.

=== Changes since 1.21.2 ===
* (bug 53032) SECURITY: Don't cache when a call could autocreate
* (bug 55332) SECURITY: Improve css javascript detection
* (bug 49717) Fix behaviour $wgVerifyMimeType = false; in Upload
* Fix comma errors in various js files
* Translations

== MediaWiki 1.21.2 ==
This is a security and maintenance release of the MediaWiki 1.21 branch.

=== Changes since 1.21.1 ===
* SECURITY: Fix extension detection with 2 .'s
* SECURITY: Support for the 'gettoken' parameter to action=block and action=unblock, deprecated since 1.20, has been removed.
* SECURITY: Sanitize ResourceLoader exception messages
* Purge upstream caches when deleting file assets.
* Unit test suite now runs the AutoLoader tests. Also fixed the autoloading entry for the PageORMTableForTesting class though it had no impact.

== MediaWiki 1.21.1 ==
This is a maintenance release of the MediaWiki 1.21 branch.

=== Changes since 1.21.0 ===
* An incorrect version number was used for 1.21.0. 1.21.1 has the correct number.
* A problem with the Oracle SQL table creation was fixed.
* (PdfHandler extension) Fix warning if pdfinfo fails but pdftext succeeds.

=== Configuration changes in 1.21 ===
* (bug 29374) $wgVectorUseSimpleSearch is now enabled by default.
* Deprecated $wgAllowRealName is removed. Use $wgHiddenPrefs[] = 'realname'
  instead.
* (bug 39957) Added $wgUnwatchedPageThreshold, specifying minimum count
  of page watchers required for the number to be accessible to users
  without the unwatchedpages permission.
* $wgBug34832TransitionalRollback has been removed.
* (bug 29472) $wgUseDynamicDates has been removed and its functionality
  disabled.

=== New features in 1.21 ===
* (bug 38110) Schema changes (adding or dropping tables, indices and
  fields) can be now be done separately from other changes that
  update.php makes.  This is useful in environments that use database
  permissions to restrict schema changes but allow the DB user that
  MediaWiki normally runs as to perform other changes that update.php
  makes.  Schema changes can be run separately.  See the file UPGRADE
  for more information.
* (bug 34876) jquery.makeCollapsible has been improved in performance.
* Added ContentHandler facility to allow extensions to support other content
  than wikitext. See docs/contenthandler.txt for details.
* New feature was developed for showing high-DPI thumbnails for high-DPI mobile
  and desktop displays (configurable with $wgResponsiveImages).
* Added new backend to represent and store information about sites and site
  specific configuration.
* jQuery upgraded from 1.8.2 to 1.8.3.
* jQuery UI upgraded from 1.8.23 to 1.8.24.
* Added separate fa_sha1 field to filearchive table. This allows sha1
  searches with the api in miser mode for deleted files.
* Add initial and programmatic sorting for tablesorter.
* Add the event "sortEnd.tablesorter", triggered after sorting has completed.
* The Job system was refactored to allow for different backing stores for
  queues as well as cross-wiki access to queues, among other things. The schema
  for the DB queue was changed to support better concurrency and reduce
  deadlock errors.
* Added ApiQueryORM class to facilitate creation of query API modules based on
  tables that have a corresponding ORMTable class.
* (bug 40876) Icon for PSD (Adobe Photoshop) file types.
* (bug 40641) Implemented Special:Version/Credits with a list of contributors.
* (bug 7851) Implemented one-click AJAX patrolling.
* The <data>, <time>, <meta>, and <link> elements are allowed within WikiText
  for use with Microdata.
* The HTML5 <mark> tag has been whitelisted.
* Added ParserCloned hook for when the Parser object is cloned.
* Added AlternateEditPreview hook to allow extensions to replace the page
  preview from the edit page.
* Added EditPage::showStandardInputs:options hook to allow extensions to add
  new fields to the "editOptions" area of the edit form.
* Upload stash DB schema altered to improve upload performance.
* The following global functions are now reporting deprecated warnings in
  debug mode: wfMsg, wfMsgNoTrans, wfMsgForContent, wfMsgForContentNoTrans,
  wfMsgReal, wfMsgGetKey, wfMsgHtml, wfMsgWikiHtml, wfMsgExt, wfEmptyMsg. Use
  the Message class, or the global method wfMessage.
* Added $wgEnableCanonicalServerLink, off by default. If enabled, a
  <link rel=canonical> tag is added to every page indicating the correct server
  to use.
* Debug message emitted by wfDebugLog() will now be prefixed with the group
  name when its logged to the default log file. That is the case whenever the
  group has no key in wgDebugLogGroups, that will help triage the default log.
* (bug 24620) Add types to LogFormatter.
* jQuery JSON upgraded from 2.3 to 2.4.0.
* Added GetDoubleUnderscoreIDs hook, for modifying the list of magic words.
* DatabaseUpdater class has two new methods to ease extensions schema changes:
  dropExtensionIndex and renameExtensionIndex.
* New preference type - 'api'. Preferences of this type are not shown on
  Special:Preferences, but are still available via the action=options API.
* (bug 39397) Hide rollback link if a user is the only contributor of the page.
* $wgPageInfoTransclusionLimit limits the list size of transcluded articles
  on the info action. Default is 50.
* Added action=createaccount to allow user account creation.
* (bug 40124) action=options API also allows for setting of arbitrary
  preferences, provided that their names are prefixed with 'userjs-'. This
  officially reenables the feature that was undocumented and defective
  in MW 1.20 (saving preferences using Special:Preferences cleared any
  additional fields) and which has been disabled in 1.20.1 as a part of
  a security fix (bug 42202).
* Added option to specify "others" as author in extension credits using
  "..." as author name.
* Added the ability to limit the wall clock time used by shell processes,
  as well as the CPU time. Configurable with $wgMaxShellWallClockTime.
* Allow memory of shell subprocesses to be limited using Linux cgroups
  instead of ulimit -v, which tends to cause deadlocks in recent versions
  of ImageMagick. Configurable with $wgShellCgroup.
* Added $wgWhitelistReadRegexp for regex whitelisting.
* (bug 5346) Categories that are redirects will be displayed italic in
  the category links section at the bottom of a page.
* (bug 43915) New maintenance script deleteEqualMessages.php.
* You can now create checkbox option matrices through the HTMLCheckMatrix
  subclass in HTMLForm.
* WikiText now permits the use of WAI-ARIA's role="presentation" inside of
  html elements and tables. This allows presentational markup, especially
  tables. To be marked up as such.
* maintenance/sql.php learned the --cluster option. Let you run the script
  on some external cluster instead of the primary cluster for a given wiki.
* (bug 20281) test the parsing of inline URLs.
* Added Special:PagesWithProp, which lists pages using a particular page property.
* Implemented language-specific collations for category sorting for 67 languages
  based in latin, greek and cyrillic alphabets. This allows one to *finally* get
  articles to be correctly sorted on category pages. They are named
  'uca-<langcode>', where <langcode> is one of: af, ast, az, be, bg, br, bs, ca,
  co, cs, cy, da, de, dsb, el, en, eo, es, et, eu, fi, fo, fr, fur, fy, ga, gd,
  gl, hr, hsb, hu, is, it, kk, kl, ku, ky, la, lb, lt, lv, mk, mo, mt, nl, no,
  oc, pl, pt, rm, ro, ru, rup, sco, sk, sl, smn, sq, sr, sv, tk, tl, tr, tt, uk,
  uz, vi.
* Added 'CategoryAfterPageAdded' and 'CategoryAfterPageRemoved' hooks.
* Added 'HistoryRevisionTools' and 'DiffRevisionTools' hooks.
* Added 'SpecialSearchResultsPrepend' and 'SpecialSearchResultsAppend' hooks.
* (bug 33186) Add image rotation api "imagerotate"
* (bug 34040) Add "User rights management" link on user page toolbox.
* (bug 45526) Add QUnit assertion helper "QUnit.assert.htmlEqual" for asserting
  structual equality of HTML (ignoring insignificant differences like
  quotmarks, order and whitespace in the attribute list).
* (bug 23393) HTML <hN> headings containing line breaks are now handled
  correctly.
* (bug 45803) Whitespace within == Headline == syntax and within <hN> headings
  is now non-significant and not preserved in the HTML output.

=== Bug fixes in 1.21 ===
* (bug 40353) SpecialDoubleRedirect should support interwiki redirects.
* (bug 40352) fixDoubleRedirects.php should support interwiki redirects.
* (bug 9237) SpecialBrokenRedirect should not list interwiki redirects.
* (bug 34960) Drop unused fields rc_moved_to_ns and rc_moved_to_title from
  recentchanges table.
* (bug 32951) Do not register internal externals with absolute protocol,
  when server has relative protocol.
* (bug 39005) When purging proxies listed in $wgSquidServers using HTTP PURGE
  method requests, we now send a Host header by default, for Varnish
  compatibility. This also works with Squid in reverse-proxy mode. If you wish
  to support Squid configured in forward-proxy mode, set
  $wgSquidPurgeUseHostHeader to false.
* (bug 37020) sql.php with readline eats semicolon.
* (bug 11748) Properly handle optionally-closed HTML tags when Tidy is
  disabled, and don't wrap HTML-syntax definition lists in paragraphs.
* (bug 41409) Diffs while editing an old revision should again diff against the
  current revision.
* (bug 41494) Honor $wgLogExceptionBacktrace when logging non-API exceptions
  caught during API execution.
* (bug 37963) Fixed loading process for user options.
* (bug 26995) Update filename field on Upload page after having sanitized it.
* (bug 41793) Contribution links to users with 0 edits on Special:ListUsers
  didn't show up red.
* (bug 41899) A PHP notice no longer occurs when using the "rvcontinue" API
  parameter.
* (bug 42036) Account creation emails now contain canonical (not
  protocol-relative) URLs.
* (bug 41990) Fix regression: API edit with redirect=true and lacking
  starttimestamp and basetimestamp should not cause an edit conflict.
* (bug 41706) EditPage: Preloaded page should be converted if possible and
  needed.
* (bug 41886) Rowspans are no longer exploded by tablesorter until the table is
  actually sorted.
* (bug 2865)  User interface HTML elements don't use lang attribute.
  (completed the fix by adding the lang attribute to firstHeading).
* (bug 42173) Removed namespace prefixes on Special:UncategorizedCategories.
* (bug 36053) Log in "returnto" feature forgets query parameters if no
  title parameter was specified.
* (bug 42410) API action=edit now returns correct timestamp for the new edit.
* (bug 14901) Email notification mistakes log action for new page creation.
  Enotif no longer sends "page has been created" notifications for some log
  actions. The following events now have a correct message: page creation,
  deletion, move, restore (undeletion), change (edit). Parameter
  $CHANGEDORCREATED is deprecated in 'enotif_body' and scheduled for removal in
  MediaWiki 1.23.
* (bug 457) In the sidebar of Vector, CologneBlue, Monobook, and Monobook-based
  skins, the heading levels have been changed from (variously per skin)
  <h4>, <h5> or <h6> to only <h3>s, with a <h2> hidden heading above them.
  If you are styling or scripting the headings in a custom way, this change
  will require updates to your site's CSS or JS.
* (bug 41342) jquery.suggestions should cancel any active (async) fetches
  before it triggers another fetch.
* (bug 42184) $wgUploadSizeWarning missing second variable.
* (bug 34581) removeUnusedAccounts.php maintenance script now ignores newuser
  log when determining whether an account is used.
* (bug 43379) Gracefully fail if rev_len is unavailable for a revision on the
  History page.
* (bug 42949) API no longer assumes all exceptions are MWException.
* (bug 41733) Hide "New user message" (.usermessage) element from printable view.
* (bug 39062) Special:Contributions will display changes that don't have
  a parent id instead of just an empty bullet item.
* (bug 37209) "LinkCache doesn't currently know about this title" error fixed.
* wfMerge() now works if $wgDiff3 contains spaces
* (bug 43052) mediawiki.action.view.dblClickEdit.dblClickEdit should trigger
  ca-edit click instead opening URL directly.
* (bug 43964) Invalid value of "link" parameter in <gallery> no longer produces
  a fatal error.
* (bug 44775) The username field is not pre-filled when creating an account.
* (bug 45069) wfParseUrl() no longer produces a PHP notice if passed a "mailto:"
  URL without address
* (bug 45012) Creating an account by e-mail can no longer show a
  "password mismatch" error.
* (bug 44599) On Special:Version, HEADs for submodule checkouts (e.g. for
  extensions) performed using Git 1.7.8+ should now appear.
* (bug 42184) $wgUploadSizeWarning missing second variable
* (bug 40326) Check if files exist with a different extension during uploading
* (bug 34798) Updated CSS for Atom/RSS recent changes feeds to match on-wiki diffs.
* (bug 42430) Calling numRows on MySQL no longer propagates unrelated errors.
* (bug 44719) Removed mention of non-existing maintenance/migrateCurStubs.php
  script in includes/DefaultSettings.php
* (bug 45143) jquery.badge: Treat non-Latin variants of zero as zero as well.
* (bug 46151) mwdocgen.php should not ignore exit code of doxygen command.
* (bug 41889) Fix $.tablesorter rowspan exploding for complex cases.

=== API changes in 1.21 ===
* prop=revisions can now report the contentmodel and contentformat.
  See docs/contenthandler.txt.
* action=edit and action=parse now support contentmodel and contentformat
  parameters to control the interpretation of page content.
  See docs/contenthandler.txt for details.
* (bug 35693) ApiQueryImageInfo now suppresses errors when unserializing metadata.
* (bug 40111) Disable minor edit for page/section creation by API.
* (bug 41042) Revert change to action=parse&page=... behavior when the page
  does not exist.
* (bug 27202) Add timestamp sort to list=allimages.
* (bug 43137) Don't return the sha1 of revisions through the API if the content is
  revision-deleted.
* ApiQueryImageInfo now also returns imageinfo for redirects.
* list=alltransclusions added to enumerate every instance of page embedding
* list=alllinks & alltransclusions now allow both 'from' and 'continue' in
  the same query. When both are present, 'from' is simply ignored.
* list=alllinks & alltransclusions now allow 'unique' in generators, to yield
  a list of all link/template target pages instead of source pages.
* BREAKING CHANGE: list=logevents output format changed for details of some log
  types. Specifically, details that were formerly reported under a key like
  "4::foo" will now be reported under a key of simply "foo".
* BREAKING CHANGE: '??_badcontinue' error code was changed to '??badcontinue'
  for all query modules.
* ApiQueryBase adds 'badcontinue' error code if module has 'continue' parameter.
* (bug 35885) Removed version parameter and all getVersion() methods.
* action=options now takes a "resetkinds" option, which allows only resetting
  certain types of preferences when the "reset" option is set.
* (bug 36751) ApiQueryImageInfo now returns imageinfo for the redirect target
  when queried with &redirects=.
* (bug 31849) ApiQueryImageInfo no longer gets confused when asked for info on
  a redirect and its target.
* (bug 43849) ApiQueryImageInfo no longer throws exceptions with ForeignDBRepo
  redirects.
* On error, any warnings generated before that error will be shown in the result.
* action=help supports generalized submodules (modules=query+value), querymodules obsolete
* ApiQueryImageInfo continuation is more reliable. The only major change is
  that the imagerepository property will no longer be set on page objects not
  processed in the current query (i.e. non-images or those skipped due to
  iicontinue).
* Add supports for all pageset capabilities - generators, redirects, converttitles to
  action=purge and action=setnotificationtimestamp.
* (bug 43251) prop=pageprops&ppprop= now accepts multiple props to query.
* ApiQueryImageInfo will now limit the number of calls to File::transform made
  in any one query. If there are too many, iicontinue will be returned.
* action=query&meta=siteinfo&siprop=general will now return the regexes used for
  link trails and link prefixes. Added for Parsoid support.
* Added an API query module list=pageswithprop, which lists pages using a
  particular page property.
* Added an API query module list=pagepropnames, which lists all page prop names
  currently in use on the wiki.
* (bug 44921) ApiMain::execute() will now return after the CORS check for an
  HTTP OPTIONS request.
* (bug 44923) action=upload works correctly if the entire file is uploaded in
  the first chunk.
* Added 'continue=' parameter to streamline client iteration over complex query results
* (bug 44909) API parameters may now be marked as type "upload", which is now
  used for action=upload's 'file' and 'chunk' parameters. This type will raise
  an error during parameter validation if the parameter is given but not
  recognized as an uploaded file.
* (bug 44244) prop=info may now return the number of people watching each page.
* (bug 33304) list=allpages will no longer return duplicate entries when
  querying protection.
* (bug 33304) list=allpages will now find really old indefinite protections.
* (bug 45937) meta=allmessages will report a syntactically invalid lang as a
  proper error instead of as an uncaught exception.
* (bug 25325) added support for wlshow filtering (bots/anon/minor/patrolled)
  to action=feedwatchlist
* WDDX formatted output will actually be formatted (and normal output will no
  longer be), and will no longer choke on booleans.

=== API internal changes in 1.21 ===
* For debugging only, a new global $wgDebugAPI removes many API restrictions when true.
  Never use on the production servers, as this flag introduces security holes.
  Whenever enabled, a warning will also be added to all output.
* ApiModuleManager now handles all submodules (actions,props,lists) and instantiation
* Query stores prop/list/meta as submodules
* ApiPageSet can now be used in any action to process titles/pageids/revids or any generator.
* BREAKING CHANGE: ApiPageSet constructor now has two params instead of three, with only the
  first one keeping its meaning. ApiPageSet is now derived from ApiBase.
* BREAKING CHANGE: ApiQuery::newGenerator() and executeGeneratorModule() were deleted.
* ApiQueryGeneratorBase::setGeneratorMode() now requires a pageset param.
* $wgAPIGeneratorModules is now obsolete and will be ignored.
* Added flags ApiResult::OVERRIDE and ADD_ON_TOP to setElement() and addValue()
* Internal API calls will now include <warnings> in case of unused parameters

=== Languages updated in 1.21 ===

MediaWiki supports over 350 languages. Many localisations are updated
regularly. Below only new and removed languages are listed, as well as
changes to languages because of Bugzilla reports.

* South Azerbaijani (azb) added.
* (bug 30040) Autonym for nds-nl is now 'Nedersaksies' (was 'Nedersaksisch').
* (bug 45436) Autonym for pi (Pali) is now 'पालि' (was ''पाळि').
* (bug 34977) Now formatted numbers in Spanish use space as separator
  for thousands, as mandated by the Real Academia Española.
* (bug 35031) Kurdish formatted numbers now use period and comma
  as separators for thousands and decimals respectively.

=== Other changes in 1.21 ===
* BREAKING CHANGE: (bug 44385) Removed the jquery.collapsibleTabs module and
  moved it to the Vector extension. It was entirely Vector-extension-specific,
  deeply interconnected with the extension, and this functionality really
  belongs to the extension instead of the skin anyway. In the unlikely case you
  were using it, you have to either copy it to your extension, or install the
  Vector extension (and possibly disable its features using config settings if
  you don't want them).
* Experimental IBM DB2 support was removed due to lack of interest and maintainership
* BREAKING CHANGE: Filenames of maintenance scripts were standardized into
  lowerCamelCase format, and made more explicit:
  - clear_stats.php -> clearCacheStats.php
  - clear_interwiki_cache.php -> clearInterwikiCache.php
  - initStats.php -> initSiteStats.php
  - proxy_check.php -> proxyCheck.php
  - stats.php -> showCacheStats.php
  - showStats.php -> showSiteStats.php.
  Class names were renamed accordingly:
  - clear_stats -> ClearCacheStats
  - InitStats -> InitSiteStats
  - CacheStats -> ShowCacheStats
  - ShowStats -> ShowSiteStats.
* BREAKING CHANGE: (bug 38244) Removed the mediawiki.api.titleblacklist module
  and moved it to the TitleBlacklist extension.

== MediaWiki 1.20 ==

== MediaWiki 1.20.8 ==
This is a security release of the MediaWiki 1.20 branch.

=== Changes since 1.20.7 ===
* (bug 53032) SECURITY: Don't cache when a call could autocreate
* (bug 55332) SECURITY: Improve css javascript detection
* (bug 49717) Fix behaviour $wgVerifyMimeType = false; in Upload
* Fix comma errors in various js files
* Translations

== MediaWiki 1.20.7 ==
This is a security release of the MediaWiki 1.20 branch.

=== Changes since 1.20.6 ===
* SECURITY: Fix extension detection with 2 .'s
* SECURITY: Token-getting functions will fail when using jsonp callbacks.
* SECURITY: Sanitize ResourceLoader exception messages
* Purge upstream caches when deleting file assets.

== MediaWiki 1.20.6 ==
This is a security and maintenance release of the MediaWiki 1.20 branch.

=== Changes since 1.20.5 ===
* (bug 48306) SECURITY: Run file validation checks on chunked uploads, and chunks of upload, during the upload process.
* (bug 44327) mediawiki.user: Use session ID instead of 1-year cross-session cookies
* (bug 47202) wikibits: FF2Fixes.css should not be loaded in Firefox 20.
* (bug 31044) Make ResourceLoader behave in read-only mode

== MediaWiki 1.20.5 ==
This is a security and maintenance release of the MediaWiki 1.20 branch.

=== Changes since 1.20.4 ===
* (bug 46590) Add hook AbortChangePassword to Special:ChangePassword
* (bug 47304) SECURITY: Check SVG xml encoding against whitelist
* Localisation updates from http://translatewiki.net.
* mwdocgen.php: Implement --version option.
* Remove svnstat stuff used in Doxygen generation
* (bug 43594) Correctly supress warnings that were missed after the upstream
* PHP change to E_STRICT being included in E_ALL.

== MediaWiki 1.20.4 ==
This is a security release of the MediaWiki 1.20 branch.

=== Changes since 1.20.3 ===
* (bug 47251) SECURITY: Disable external entities in Import
* (bug 46859) SECURITY: Disable external entities in XMLReader
* (bug 46084) SECURITY: Sanitize $limitReport before outputting

== MediaWiki 1.20.3 ==
This is a security and maintenance release of the MediaWiki 1.20 branch.

== MediaWiki 1.20.2 ==
* New preference type - 'api'. Preferences of this type are not shown on Special:Preferences, but are still available via the action=options API. (Unbreaks MLEB.)
* (bug 44010) Context is passed to UserGetLanguageObject.
* The recursion guard on RequestContext::getLanguage() was weakened.
* (bug 40585) Don't drop 'step="any"' in HTML input fields.
* (bug 44024) Fixed problems in ObjectCache when using XCache.
* (bug 44010) FauxRequest leaked cookie data from primary request.
* (bug 44135/bug 42441) Pass '2' instead of 'true' to CURLOPT_SSL_VERIFYHOST
* (bug 43518) API action=unblock should return the user name, not the full user object
* (bug 45355) Prevent read of arbitrary files through mwdoc-filter.php

== MediaWiki 1.20.2 ==
This is a maintenance release of the MediaWiki 1.20 branch

== MediaWiki 1.20.1 ==
* (bug 42638) Fix API action=options&reset=1 & unit tests.
* (bug 42370) Fixed backport of 60cc060 to use mDoneWrites — caused * (bug 42592) User rights, preferences and other things are not saving in 1.20.1.

== MediaWiki 1.20.1 ==
This is a security release of the MediaWiki 1.20 branch

Changes since 1.20
* (bug 42202) Validate options to prevent html injection
* (bug 40995) Prevent session fixation in Special:UserLogin (CVE-2012-5391)
* (bug 41400) Prevent linker regex from exceeding PCRE backtrack limit
* Javscript Lint fixes
* (bug 40632) Remove CleanupPresentationalAttributes feature
* [Database] Fixed case where trx idle callbacks might be lost.



== MediaWiki 1.20 ==

=== PHP 5.3 now required ===
Since 1.20, the lowest supported version of PHP is now 5.3.2. Please
upgrade PHP if you have not done so prior to upgrading MediaWiki.

=== Configuration changes in 1.20 ===
* $wgGitRepositoryViewers defines a mapping from Git remote repository to the
  Gitweb instance URL used in Special:Version.
* `$wgUsePathInfo = true;` is no longer needed to make $wgArticlePath work on servers
  using like nginx, lighttpd, and apache over fastcgi. MediaWiki now always extracts
  path info from REQUEST_URI if it's available.
* The user right 'upload_by_url' is no longer given to sysops by default.
  This only affects installations which have $wgAllowCopyUploads set to true.
* Removed f-prot support from $wgAntivirusSetup.
* New variable $wgDBerrorLogTZ to provide dates in the error log in a
  different timezone than the wiki timezone set by $wgLocaltimezone.
* New variables $wgDBssl and $wgDBcompress to enable SSL and compression for database
  connections, if either are available for the selected DB type.
* $wgUseCombinedLoginLink now defaults to false, making MediaWiki output separate
  login and create account links by default.

=== New features in 1.20 ===
* Added TitleIsAlwaysKnown hook which gets called when determining if a page exists.
* Added NamespaceIsMovable hook which gets called when determining if pages in a
  certain namespace can be moved.
* Added SpecialPageBeforeExecute hook which gets called before SpecialPage::execute.
* Added SpecialPageAfterExecute hook which gets called after SpecialPage::execute.
* Added ORMTable, ORMRow and ORMResult classes for additional abstraction of
  database interaction.
* Added CacheHelper and associated SpecialCachedPage and CachedAction helper classes.
* (bug 32341) Add upload by URL domain limitation.
* &useskin=default will now always display the default skin. Useful for users with a
  preference for the non-default skin to look at something using the default skin.
* (bug 27619) Remove preference option to display broken links as link?
* (bug 34896) jQuery JSON plugin upgraded to v2.3 (2011-09-17).
* (bug 34302) Add CSS classes to email fields in user preferences.
* Introduced $wgDebugDBTransactions to trace transaction status (currently PostgreSQL only).
* (bug 23795) Add parser itself to ParserMakeImageParams hook.
* Introduce a cryptographic random number generator source api for use when
  generating various tokens.
* (bug 30963) Option on Special:Prefixindex and Special:Allpages to not show redirects.
* (bug 18062) New message when edit or create the local page of a shared file.
* (bug 22870) Separate interface message when creating a page.
* (bug 17615) nosummary option should be reassigned on preview/captcha.
* (bug 34355) Add a variable and parser function for the namespace number.
* (bug 35649) Special:Version now shows hashes of extensions checked out from git.
* (bug 35728) Git revisions are now linked on Special:Version.
* "Show Changes" on default messages shows now diff against default message text
* (bug 23006) create #speciale parser function.
* generateSitemap can now optionally skip redirect pages.
* (bug 27757) New API command just for retrieving tokens (not page-based).
* Added GitViewers hook for extensions using external git repositories to have a web-based
  repository viewer linked to from Special:Version.
* Memcached debug logs can now be sent to their own file logs by setting
  $wgDebugLogFile['memcached'] to some filepath.
* (bug 35685) api.php URL and other entry point URLs are now listed on
  Special:Version
* Edit notices can now be translated.
* jQuery upgraded to 1.8.2.
* jQuery UI upgraded to 1.8.23.
* QUnit upgraded from v1.2.0 to v1.10.0.
* (bug 37604) jquery.cookie upgraded to 2011 version.
* (bug 22887) Add warning and tracking category for preprocessor errors
* (bug 31704) Allow selection of associated namespace on the watchlist
* (bug 5445) Now remove autoblocks when a user is unblocked.
* Added $wgLogExceptionBacktrace, on by default, to allow logging of exception
  backtraces.
* Added device detection for determining device capabilities.
* QUnit.newMwEnvironment now supports passing a custom setup and/or teardown function.
  Arguments signature has changed. First arguments is now an options object of which
  'config' can be a property. Previously 'config' itself was the first and only argument.
* New getCreator and getOldestRevision methods added to WikiPage class
* (bug 4220) the XML dump format schema now have unique identity constraints
  for page and revision identifiers. Patch by Elvis Stansvik.
* cleanupSpam.php now can delete spam pages if --delete was specified instead of blanking
  them.
* Added new hook ChangePasswordForm to allow adding of additional fields in Special:ChangePassword
* Added new function getDomain to AuthPlugin for getting a user's domain
* (bug 23427) New magic word {{PAGEID}} which gives the current page ID.
  Will be null on previewing a page being created.
* (bug 37627) UserNotLoggedIn() exception to show a generic error page whenever
  a user is not logged in.
* Watched status in changes lists are no longer indicated by <strong></strong>
  tags with class "mw-watched". Instead, each line now has a class
  "mw-changeslist-line-watched" or "mw-changeslist-line-not-watched", and the
  title itself is surrounded by <span></span> tags with class "mw-title".
* Added ContribsPager::reallyDoQuery hook allowing extensions to data to MyContribs
* Added new hook ParserAfterParse to allow extensions to affect parsed output
  after the parse is complete but before block level processing, link holder
  replacement, and so on.
* (bug 34678) Added InternalParseBeforeSanitize hook which gets called during Parser's
  internalParse method just before the parser removes unwanted/dangerous HTML tags.
* Added new hook AfterFinalPageOutput to allow modifications to buffered page output before sent
  to the client.
* (bug 36783) Implement jQuery Promise interface in mediawiki.api module.
* Make dates in sortable tables sort according to the page content language
  instead of the site content language
* (bug 37926) Deleterevision will no longer allow users to delete log entries,
  the new deletelogentry permission is required for this.
* (bug 14237) Allow PAGESINCATEGORY to distinguish between 'all', 'pages', 'files'
  and 'subcats'
* (bug 38362) Make Special:Listuser includeable on wiki pages.
* Added support in jquery.localize for placeholder attributes.
* (bug 38151) Implemented mw.user.getRights for getting and caching the current
  user's user rights.
* Session storage can now configured independently of general object cache
  storage, by using $wgSessionCacheType. $wgSessionsInMemcached has been
  renamed to $wgSessionsInObjectCache, with the old name retained for backwards
  compatibility. When this feature is enabled, the expiry time can now be
  configured with $wgObjectCacheSessionExpiry.
* Added a Redis client for object caching.
* Implemented mw.user.getGroups for getting and caching user groups.
* (bug 37830) Added $wgRequirePasswordforEmailChange to control whether password
  confirmation is required for changing an email address or not.
* HTMLForm mutators can now be chained (they return $this)
* A new message, "api-error-filetype-banned-type", is available for formatting
  API upload errors due to the file extension blacklist.
* New hook 'ParserTestGlobals' allows to set globals before running parser tests.
* Allow importing pages as subpage.
* Add lang and hreflang attributes to language links on Login page.
* (bug 22749) Create Special:MostInterwikis.
* Show change tags when transclude Special:Recentchanges(linked) or Special:Newpages.
* (bug 23226) Add |class= parameter to image links in order to add class(es) to HTML img tag.
* (bug 39431) SVG animated status is now shown in long description.
* (bug 39376) jquery.form upgraded to 3.14.
* SVG files will now show the actual width in the SVG's specified units
  in the metadata box.
* Added ResourceLoader module "jquery.jStorage" (v0.3.0, http://jStorage.info/).
* (bug 39273) Added AJAX support for "Show changes" (diff) in LivePreview.
* Added ResourceLoader module "jquery.badge".
* mw.util.$content now points to the overall content area in the skin rather than just
  page text content area. If you need the old behavior please use $( '#mw-content-text').
* jsMessage has been replaced with a floating bubble notification system complete
  with auto-hide, multi-message support, and message replacement tags.
* jquery.messageBox which appears to be unused by both core and extensions has
  been removed.
* (bug 34939) Made link parsing insensitive ([HttP://]).
* (bug 40072) Add CSS classes to items in output of ChangesList pages.
* Added $wgCopyUploadProxy global to define which proxy to use for copy
  uploads.
* (bug 40448) mediawiki.legacy.mwsuggest has been replaced with a new module,
  mediawiki.searchSuggest, based on SimpleSearch from Extension:Vector.

=== Known issues in 1.20.0 ===
These are issues that we're targeting to be fixed in a later release
in the 1.20 series.  Issues may be added or removed from this list as
we see fit.  For now, it is comprised of those bugs on the 1.20.0
milestone in Bugzilla.

* (bug 35894): Reports of secret key generation "hanging" on windows
    This is probably a bug that has been fixed in PHP.  If you run
    into this, try upgrading your PHP.
* (bug 38334): PHP Notice:  Undefined index: href in /www/w/skins/Vector.php on line 416
    We think this is a problem in some extension.  If you see this,
    try disabling your extensions and check out the logging patch on
    this bug.  Or try this patch:
    <https://gerrit.wikimedia.org/r/#/c/27937/1/skins/Vector.php>
* (bug 39268): [Regression] Toolbar inserts in main textarea only (instead of the focussed textarea)
    This should only be an issue if you are using the ProofreadPage
    extension.
* (bug 40641): Clicking "others" in Special:Version asks to download a file
    If you encounter this, you can tell your webserver to serve the
    CREDITS file with text/plain MIME type to fix it.

=== Bug fixes in 1.20 ===
* (bug 40939): [Regression] InfoAction: Call to a member function getUserText() on a non-object
* (bug 40780): searchsuggest-containing line ("containing...") doesn't include the entered text
* (bug 37714): [Regression] Incomplete log entries
* (bug 27202): API: Add timestamp sort to list=allimages
* (bug 30245) Use the correct way to construct a log page title.
* (bug 34237) Regenerate an empty user_token and save to the database
  when we try to set the user's cookies for login.
* (bug 32210) New edit emails for watched pages always provide a link to the
  edit which triggered the mail.
* (bug 12021) Added user talk link on Special:Listusers.
* (bug 34445) section edit and TOC hide/show links are excluded from selection and
  copy/paste on supporting browsers.
* (bug 34428) Fixed incorrect hash mismatch errors in the DiffHistoryBlob
  history compression method.
* (bug 34702) Localised parentheses are now used in more special pages.
* (bug 34723) When editing a script page on a RTL wiki the textbox should be LTR.
* (bug 34762) Calling close() on a DatabaseBase object now clears the connection.
* (bug 34863) Show deletion log extract on non-existent file pages if applicable.
* (bug 28019) Let ?preloadtitle=foo be passed on to target of
  Special:MyPage and Special:MyTalk.
* (bug 34929) Show the correct diff when a section edit is rejected by the spam
  filter.
* (bug 15816) Add a switch for SETting the search_path (Postgres).
* (bug 34521) Returning to the previous page after logging in loses any array-
  valued parameters in the query string.
* (bug 34735) Updated compressOld.php documentation to mention the different
  usages of -s and -n parameters depending on compression type.
* (bug 13896) Rendering of devanagari numbers in automatic '#' number lists.
* (bug 33689) Upgrade to 1.19 on Postgres fails due to incomplete query when
  trying to defer foreign key for externallinks.
* (bug 32748) Printer friendly version of article decode Unicode chars as a
  pretty IRI in footer.
* Removed white border around thumbnails in galleries.
* (bug 31236) "Next" and "Previous" buttons are shown incorrectly in
  an RTL environment.
* (bug 35749) Updated maintenance/checkSyntax.php to use Git instead of
  Subversion when invoked with the --modified option.
* (bug 35069) On history pages, the " . . " separator after the number of
  characters changed in a revision is now suppressed if no text would follow.
* (bug 18704) Add a unique CSS class or ID to the tagfilter table row at RecentChanges
* (bug 33564) transwiki import sometimes result in invalid title.
* (bug 35572) Blocks appear to succeed even if query fails due to wrong DB structure
* (bug 31757) Add a word-separator between help-messages in HTMLForm
* (bug 30410) Removed deprecated $wgFilterCallback and the 'filtered' API error.
* (bug 32604) Some messages needs escaping of wikitext inside username.
* (bug 36537) Rename wfArrayToCGI to wfArrayToCgi for consistency with wfCgiToArray.
* (bug 25946) The message on the top of Special:RecentChanges is now displayed
  in user language instead of content language.
* (bug 35264) Wrong type used for <ns> in export.xsd
* (bug 24985) Use $wgTmpDirectory as the default temp directory so that people
  who don't have access to /tmp can specify an alternative.
* (bug 27283) SqlBagOStuff breaks PostgreSQL transactions.
* (bug 35727) mw.Api ajax() should put token parameter last.
* (bug 37708) mw.Uri.clone() should make a deep copy.
* (bug 38024) ResourceLoader should not create empty stylesheets for modules
  that don't have stylesheets.
* (bug 36812) Special:ActiveUsers "Hide bots" should hide users from any group
  having the "bot" user right, instead of just the default "bot" user group.
* (bug 35082) mw.util.addPortletLink incorrectly adds link to mutiple <ul> tags.
* (bug 36991) jquery.tablesorter should extract date sort format from date
  string instead of global config. Dates like "April 1 2012" and "1 April 2012"
  now sort correctly regardless of the content language's DefaultDateFormat.
* (bug 31895) mw.loader mode now correct when triggered from a $.fn.ready
  handler that is bound before mediawiki.js's handler (e.g. browser-userscripts
  like greasemonkey).
* (bug 38152) jquery.tablesorter: Use .data() instead of .attr(), so that live
  values are used instead of just the fixed values from when the tablesorter
  was initialized.
* (bug 38093) Gender of changed user groups missing in Special:Log/rights
* (bug 35893) Special:Block needs to load mediawiki.special.block.js.
* (bug 37331) ResourceLoader modules sometimes execute twice in Firefox
* (bug 31644) GlobalUsage, CentralAuth and AbuseLog extensions should not use
  insecure links to foreign wikis in the WikiMap.
* (bug 36073) Avoid duplicate element IDs on File pages.
* (bug 25095) Special:Categories should also include the first relevant item
  when "from" is filled.
* (bug 35526) jquery.tablesorter now uses a stable sort.
* (bug 38953) --memory-limit switch not working for runJobs.php.
* (bug 33037) Make subpage of Special:newfiles control how many files
  are returned, like in previous versions.
* (bug 36524) "Show" options on Special:RecentChanges and Special:RecentChangesLinked
  are now remembered between successive clicks.
* (bug 26069) Page title is no longer "Error" for all error pages.
* (bug 39297) Show warning if thumbnail of animated image will not be animated.
* (bug 38249) Parser will throw an exception instead of outputting gibberish if
  PCRE is compiled without support for unicode properties.
* (bug 30390) Suggested file name on Special:Upload should not contain
  illegal characters.
* EXIF below sea level GPS altitude data is now shown correctly.
* (bug 39284) jquery.tablesorter should not consider "."" or "?"" to be a currency.
* (bug 39273) "Show changes" should not be incorrectly displayed in the Live Preview state.
* Made body-content lang attribute honor the variant language when it is set.
* (bug 36761) "Mark pages as visited" now submits previously established filter options.
* (bug 39635) PostgreSQL LOCK IN SHARE MODE option is a syntax error.
* (bug 36329) Accesskey tooltips for Firefox 14 on Mac should use "ctrl-option-" prefix.
* (bug 32552) Drop unused database field cat_hidden from table category.
* (bug 24502) Do not allow multiple language links to the same language.
* (bug 40214) Category pages no longer use deprecated "width" HTML attribute.
* (bug 39941) Add missing stylesheets to the installer pages
* In HTML5 mode, allow new input element types values (such as color, range..)
* (bug 36151) mw.Title: Don't limit extension in title parsing.
* (bug 38158) jquery.byteLimit sometimes causes an unexpected 0 maxLength being enforced.
* (bug 38163) jquery.byteLimit incorrectly limits input when using methods other than
  basic per-char typing.
* (bug 34495) patrol log now credit the user patrolling (instead of patrolled
  user).
* (bug 31676) ResourceLoader should work around IE stylesheet limit.
* (bug 40498) ResourceLoader should not output an empty "@media print { }" block.
* (bug 40500) ResourceLoader should not ignore media-type for urls in debug mode.
* (bug 40660) ResourceLoaderWikiModule should not convert "&nbsp;" to a space
  for pages from the MediaWiki-namespace.
* (bug 40329) (bug 40632) Removed CleanupPresentationalAttributes feature.

=== API changes in 1.20 ===
* (bug 34316) Add ability to retrieve maximum upload size from MediaWiki API.
* (bug 34313) MediaWiki API intro message about "HTML format" should mention
  the format parameter.
* (bug 32384) Allow descending order for list=watchlistraw.
* (bug 31883) Limit of bkusers of list=blocks and titles of action=query is
  not documented in API help.
* (bug 32492) API now allows editing using pageid.
* (bug 32497) API now allows changing of protection level using pageid.
* (bug 32498) API now allows comparing pages using pageids.
* (bug 30975) API import of pages with invalid characters in this wiki leads to Fatal Error.
* (bug 30488) API now allows listing of backlinks/embeddedin/imageusage per pageid.
* (bug 34927) Output media_type for list=filearchive.
* (bug 28814) add properties to output of action=parse.
* (bug 33224) add variants of content language to meta=siteinfo.
* (bug 32643) action=purge with forcelinkupdate no longer crashes when ratelimit is reached.
* The paraminfo module now also contains result properties for most modules.
* (bug 32348) Allow descending order for list=alllinks.
* (bug 31777) Upload unknown error ``fileexists-forbidden''.
* (bug 32382) Allow descending order for list=iwbacklinks.
* (bug 32381) Allow descending order for list=backlinks, list=embeddedin and list=imageusage.
* (bug 32383) Allow descending order for list=langbacklinks.
* API meta=siteinfo can now return the list of known variable IDs.
* (bug 35980) list=deletedrevs now honors drdir correctly in "all" mode (mode #3).
* (bug 29290) API avoids mangling fields in continuation parameters
* (bug 36987) API avoids mangling fields in continuation parameters
* (bug 30836) siteinfo prop=specialpagealiases will no longer return nonexistent special pages
* (bug 38190) Add "required" flag to some token params for hint in api docs.
* (bug 27567) Add file repo support to prop=duplicatefiles.
* (bug 27610) Add archivename for non-latest image version to list=filearchive
* (bug 38231) Add xml parse tree to action=parse.
* Watchlist notification timestamp may be queried by page and may be updated via the API.
* (bug 38904) prop=revisions&rvstart=... no longer blows up when continuing.
* (bug 39032) ApiQuery generates help in constructor.
* (bug 11142) Improve file extension blacklist error reporting in API upload.
* (bug 39665) List of query generators is now not built using reflection, instead it is
  defined in code.
* (bug 35993) Deprecated gettoken parameter - support will be removed in 1.22.

=== Languages updated in 1.20 ===

MediaWiki supports over 350 languages. Many localisations are updated
regularly. Below only new and removed languages are listed, as well as
changes to languages because of Bugzilla reports.

* Emilian (egl) added.
* Tornedalen Finnish (fit) added.
* Mizo (lus) added.
* Santali (sat) added.
* (bug 34192) Namespace gender aliases for Albanian languages (sq & aln).
* (bug 35541) Namespace gender aliases for Croatian (hr).
* (bug 36012) Space in $separatorTransformTable should be non-breaking in
  Portuguese, Esperanto and Udmurt.
* Turoyo (tru) added.
* Cyrillic-Latin language converter added for Uzbek (uz).

=== Other changes in 1.20 ===
* The user_token field is now left empty until a user attempts to login and
  cookies need to be set. It is also now possible to reset every user's
  user_token simply by clearing the values in the user_token column.
* Removed ./tests/qunit/index.html from core. It wasn't actively maintained and
  has been made obsolete when [[Special:JavaScriptTest/qunit]] was introduced,
  which actually uses ResourceLoader, LocalSettings and the Skin.
* Removed $wgDBtransactions global. This was only checked in one class
  and only applies to MyISAM or similar DBs. Those should only be used
  for archived sites anyway. We can't get edit conflicts on such sites,
  so the WikiPage code wasn't useful there either.
* Deprecated mw.user.name in favour of mw.user.getName.
* Deprecated mw.user.anonymous in favour of mw.user.isAnon.
* Deprecated DatabaseBase functions newFromParams(), newFromType(), set(),
  quote_ident(), and escapeLike() were removed.
* Use of __DIR__ instead of dirname( __FILE__ ).
* OutputPage::wrapWikiMsg() no longer supports the 'options' parameter. It was
  not used and complicated migration to Message class.
* Live preview functionality has been improved and moved into the
 'mediawiki.action.edit.preview' module. The old 'mediawiki.legacy.preview' module
  has been removed.
* (bug 40448) Removed mediawiki.legacy.mwsuggest module, and removed the
  following that has become obsolete:
  - globals $wgEnableMWSuggest and $wgMWSuggestTemplate.
  - mw.config.values wgMWSuggestTemplate and wgSearchNamespaces.
  - method SearchEngine::getMWSuggestTemplate().

== MediaWiki 1.19 ==

== MediaWiki 1.19.21 ==
This is a maintenance release of the MediaWiki 1.19 branch.

=== Changes since 1.19.20===
* (bug 67440) Allow classes to be registered properly from installer.
* (bug 47281) Fixed a dumpBackup.php error with --uploads --include-filesoptions: Unable to find the wrapper "mwstore". * System administrators are encouraged to upgrade to this release or 1.22+ and produce a full data dump. https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Backing_up_a_wiki
* (bug 63049) Removed anonymous functions from ApiFormatBase, added in1.19.13 as part of the fix for bug 61362, for PHP 5.2 compatibility.

== MediaWiki 1.19.20 ==
This is a security release of the MediaWiki 1.19 branch.

=== Changes since 1.19.19===
* (bug 70672) SECURITY: OutputPage: Remove separation of css and js module allowance.

== MediaWiki 1.19.19 ==
This is a security release of the MediaWiki 1.19 branch.

=== Changes since 1.19.18===
* (bug 69008) SECURITY: Enhance CSS filtering in SVG files. Filter <style> elements; normalize style elements and attributes before filtering; add checks for attributes that contain css; add unit tests for html5sec and reported bugs.

== MediaWiki 1.19.18 ==
This is a security release of the MediaWiki 1.19 branch.

=== Changes since 1.19.17===
* (bug 68187) SECURITY: Prepend jsonp callback with comment.
* (bug 65778) SECURITY: Copy prevent-clickjacking between OutputPage and ParserOutput.

== MediaWiki 1.19.17 ==
This is a security and maintenance release of the MediaWiki 1.19 branch.

=== Changes since 1.19.16===
* (bug 65839) SECURITY: Prevent external resources in SVG files.
* (bug 66428) MimeMagic: Don't seek before BOF. This has weird side effects like only extracting the tail of the file partially or not at all.

== MediaWiki 1.19.16 ==
This is a security release of the MediaWiki 1.19 branch.

=== Changes since 1.19.15===
* (bug 65501) SECURITY: Don't parse usernames as wikitext on Special:PasswordReset.

== MediaWiki 1.19.15 ==
This is a security and maintenance release of the MediaWiki 1.19 branch.

=== Changes since 1.19.14===
Fixed resetting passwords.
* (bug 58640) Fixed a compatibility issue with PCRE 8.34 that caused pages to appear blank or with missing text.

== MediaWiki 1.19.14 ==
This is a security and maintenance release of the MediaWiki 1.19 branch.

=== Changes since 1.19.13===
* (bug 62497) SECURITY: Add CSRF token on Special:ChangePassword.
* (bug 62467) Set a title for the context during import on the cli.

== MediaWiki 1.19.13 ==
This is a security and maintenance release of the MediaWiki 1.19 branch.

=== Changes since 1.19.12===
* (bug 61362) SECURITY: API: Don't find links in the middle of api.php links.
* Use the correct branch of the extensions' git repositories.

== MediaWiki 1.19.12 ==
This is a security release of the MediaWiki 1.19 branch.

=== Changes since 1.19.11===
* (bug 60771) SECURITY: Disallow uploading SVG files using non-whitelisted namespaces. Also disallow iframe elements. * User will get an error including the namespace name if they use a non- whitelisted namespace.
* (bug 61346) SECURITY: Make token comparison use constant time. It seems like our token comparison would be vulnerable to timing attacks. This will take constant time.

== MediaWiki 1.19.11 ==
This is a security release of the MediaWiki 1.19 branch.

=== Changes since 1.19.10===
* (bug 60339) SECURITY: Sanitize shell arguments to DjVu files, and other media formats

== MediaWiki 1.19.10 ==
This is a security release of the MediaWiki 1.19 branch.

=== Changes since 1.19.9===
* (bug 57550) SECURITY: Disallow stylesheets in SVG Uploads
* (bug 58088) SECURITY: Don't normalize U+FF3C to \ in CSS Checks
* (bug 58472) SECURITY: Disallow -o-link in styles
* (bug 58553) SECURITY: Return error on invalid XML for SVG Uploads
* (bug 58699) SECURITY: Fix RevDel log entry information leaks

== MediaWiki 1.19.9 ==
This is a security and maintenance release of the MediaWiki 1.19 branch.

=== Changes since 1.19.8===
* (bug 53032) SECURITY: Don't cache when a call could autocreate
* (bug 55332) SECURITY: Improve css javascript detection
* (bug 49717) Fix behaviour $wgVerifyMimeType = false; in Upload
* Translations

== MediaWiki 1.19.8 ==
2013-09-03

This is a security and maintenance release of the MediaWiki 1.19 branch.

=== Changes since 1.19.7===
* SECURITY: Sanitize ResourceLoader exception messages
* SECURITY: Token-getting functions will fail when using jsonp callbacks.
* SECURITY: Fix extension detection with 2 .'s
* Allow a string other than '*' as condition for DatabaseBase::delete()
* Purge upstream caches when deleting file assets.
* jquery.tablesorter: Add missing dependency on jquery.mwExtension

== MediaWiki 1.19.7 ==
2013-05-21

This is a security release of the MediaWiki 1.19 branch

=== Changes since 1.19.6===
* (bug 48306) SECURITY: Run file validation checks on chunked uploads, and chunks of upload, during the upload process.

== MediaWiki 1.19.6 ==
2013-04-30

This is a security and maintenance release of the MediaWiki 1.19 branch

=== Changes since 1.19.5===
* (bug 47304) SECURITY: Check SVG xml encoding against whitelist
* (bug 46590) Added AbortChangePassword hook to allow extensions to abort password changes from Special:ChangePassword
* Localisation updates from http://translatewiki.net.
* mwdocgen.php: Implement --version option.
* Remove svnstat stuff used in Doxygen generation
* E_USER_DEPRECATED undefined prior to php 5.3

== MediaWiki 1.19.5 ==
2013-04-15

This is a security and maintenance release of the MediaWiki 1.19 branch

=== Changes since 1.19.4===
* (bug 47251) SECURITY: Disable external entities in Import
* (bug 46859) SECURITY: Disable external entities in XMLReader
* (bug 46084) SECURITY: Sanitize $limitReport before outputting
* (bug 43594) Fix notices displayed on PHP 5.4
* (bug 40585) Don't drop 'step="any"' in HTML input fields.

== MediaWiki 1.19.4 ==
2013-03-04

This is a security release of the MediaWiki 1.19 branch

=== Changes since 1.19.3===
* New preference type - 'api'. Preferences of this type are not shown on Special:Preferences, but are still available via the action=options API.
* (bug 44010) Context is passed to UserGetLanguageObject.
* The recursion guard on RequestContext::getLanguage() was weakened.
* (bug 44135/bug 42441) Pass '2' instead of 'true' to CURLOPT_SSL_VERIFYHOST
* (bug 43518) API action=unblock should return the user name, not the full user object

== MediaWiki 1.19.3 ==
2012-11-30

This is a security release of the MediaWiki 1.19 branch

=== Changes since 1.19.2===
* (bug 40995) Prevent session fixation in Special:UserLogin (CVE-2012-5391)
* (bug 41400) Prevent linker regex from exceeding PCRE backtrack limit
* Increase permitted runtime for testParserTest (only used for continuous integration).
* Updated messages translations from http://translatewiki.net/

== MediaWiki 1.19.2 ==

This is a security release of the MediaWiki 1.19 branch

=== Changes since 1.19.1 ===
* (bug 39700) File: link to non-existing file can inject html
* (bug 39823) Hidden block text leaking to admins
* (bug 39184) LDAP password leakage
* (bug 39180) Disallow framing of api results
* (bug 37587) Enforce language codes to be html safe
* (bug 39824) Check global blocks on account creation

== MediaWiki 1.19 ==

MediaWiki 1.19 is a large release that contains many new features and bug
fixes. This is a summary of the major changes of interest to users.
You can consult the RELEASE-NOTES-1.19 file for the full list of changes in
this version.

Our thanks go to everyone who helped to improve MediaWiki by testing the beta
release and submitting bug reports.

=== Changes since 1.19.1 ===
* (bug 38406) Properly quote table names in DatabaseBase::tableName()
* (bug 38249) Parser will throw an exception instead of outputting gibberish if
  PCRE is compiled without support for unicode properties.

=== Changes since 1.19.0 ===
* (bug 36568) Fixed "Illegal string offset 'LIMIT'" warnings in updater
* (bug 36938) Correctly escape uselang attribute to prevent xss
* Expanded Blacklist for SVG Files

=== Changes since 1.19 beta 2 ===
* Special:Watchlist no longer sets links to feed when the user is anonymous.
* (bug 35961) Hash comparison should always be strict.
* Fix broken email confirmation expiration caused by MWCryptRand changes.
* (bug 35671) PHP Notice: Undefined index: gettoken in includes/api/ApiMain.php
  on line 598.
* (bug 36042) 'show' causes a fatal in blocks API.

=== Changes since 1.19 beta 1 ===
* (bug 35014) Including a special page no longer sets the page's title to the
  included page
* (bug 35019) Edit summaries are no longer transformed in notification e-mails
* (bug 35152) Help message for e-mail is shown again in user preferences
* (bug 34887) $3 and $4 parameters are now substituted correctly in message
  "movepage-moved"
* (bug 34841) Edit links are no longer displayed when display old page versions
* (bug 34889) User name should be normalized on Special:Contributions
* (bug 35051) If heading has a trailing space after == then its name is not
  preloaded into edit summary on section edit
* (bug 31417) New ID mw-content-text around the actual page text, without categories,
  contentSub, ... The same div often also contains the class mw-content-ltr/rtl.
* (bug 35303) Proxy and DNS blacklist blocking works again
* (bug 22555) Remove or skip strip markers from tag hooks like &lt;nowiki&gt; in
  core parser functions which operate on strings, such as padleft.
* (bug 18295) Don't expose strip markers when a tag appears inside a link
  inside a heading.
* (bug 34212) ApiBlock/ApiUnblock allow action to take place without a token
  parameter present.
* (bug 34907) Fixed exposure of tokens through load.php that could have facilitated
  CSRF attacks.
* (bug 35317) CSRF in Special:Upload.

=== Configuration changes in 1.19 ===
* Removed SkinTemplateSetupPageCss hook; use BeforePageDisplay instead.
* (bug 27132) movefile right granted by default to registered users.
* Default cookie lifetime ($wgCookieExpiration) is increased to 180 days.
* (bug 31204) Removed old user.user_options.
* $wgMaxImageArea now applies to jpeg files if they are not scaled with
  ImageMagick.
* Introduced $wgQueryPageDefaultLimit (defaults to 50) for the number of
  items to show by default on query pages (special pages such as Whatlinkshere).
* (bug 32470) Increase the length of ug_group.
* (bug 32239) Removed $wgEnableTooltipsAndAccesskeys.
* Removed $wgVectorShowVariantName.
* Removed $wgExtensionAliasesFiles. Use $wgExtensionMessagesFiles.
* Removed $wgResourceLoaderInlinePrivateModules , now always enabled.

=== New features in 1.19 ===
* (bug 19838) Add ability to get all interwiki prefixes also if the interwiki
  cache is used.
* $wgDnsBlacklistUrls now accepts an array with url and key as the
  elements to work with DNSBLs that require keys, such as
  Project Honeypot.
* (bug 30022) Add support for custom loadScript sources to ResourceLoader.
* (bug 19052) Unicode space separator characters (Zs) now terminates external
  links and images links.
* (bug 30160) Add public method to mw.loader to get module names from registry.
* (bug 15558) Parameters to special pages included in wikitext can now be passed
  as with templates.
* Installer now issues a warning if mod_security is present.
* (bug 29455) Add support for a filter callback function in jQuery byteLimit
  plugin.
* Added two new GetLocalURL hooks to better serve extensions working on a
  limited type of titles.
* Added a --no-updates flag to importDump.php that skips updating the links
  tables.
* Most presentational html attributes like valign are now converted to inline
  css style rules. These attributes were removed from html5 and so we clean
  them up when $wgHtml5 is enabled. This can be disabled using
  $wgCleanupPresentationalAttributes.
* Magic words (time and number-formatting ones, plus DIRECTIONMARK, but not
  NAMESPACE) now depend on the page content language instead of the site
  language. In theory this sets the right magic words in system messages,
  although they are not used there.
* (bug 30451) Add page_props to RefreshLinks::deleteLinksFromNonexistent.
* (bug 30450) Clear page_props table on page deletion.
* Hook added to check for exempt from account creation throttle.
* (bug 30344) Add configuration variable for setting custom priorities when
  generating sitemaps.
* (bug 96170) Add array support for space-separated list attributes (like
  'class') in the Html helper class.
* (bug 26470) Add checkered background image on hover on files pages.
* (bug 30774) mediawiki.html: Add support for numbers and booleans in the
  attribute values and element contents.
* Conversion script between Tifinagh and Latin for the Tachelhit language.
* (bug 16755) Add options 'noreplace' and 'noerror' to {{DEFAULTSORT:...}}
  to stop it from replace an already existing default sort, and suppress error.
* (bug 18578) Rewrote revision delete related messages to allow better
  localisation.
* (bug 30364) LanguageConverter now depends on the page content language
  instead of the wiki content language.
* Jump links will now be usable in CSS-capable browsers instead of only
  in outdated text browsers.
* New common*.css files usable by skins instead of having to copy piles
  of generic styles from MonoBook or Vector's css.
* Some deprecated presentational html attributes will now be automatically
  converted to css.
* (bug 31297) Add support for namespaces in Special:RecentChanges subpage filter
  syntax.
* The default user signature now contains a talk link in addition to the user link.
* (bug 25306) Add link of old page title to MediaWiki:Delete_and_move_reason.
* Added hook BitmapHandlerCheckImageArea.
* (bug 30062) Add $wgDBprefix option to cli installer.
* getUserPermissionsErrors and getUserPermissionsErrorsExpensive hooks are now
  also called when checking for 'read' permission.
* Introduce $wgEnableSearchContributorsByIP which controls whether searching
  for an IP address redirects to the contributions list for that IP.
* (bug 8859) Database::update should take array of tables too.
* (bug 19698) Add "Inverse namespaces" option to Special:Contributions.
* (bug 24037) Add byte length of revision to Special:Contributions.
* (bug 1672) Added $wgDisableUploadScriptChecks to allow uploading of files
  containing HTML or JS. DISABLING THESE CHECKS IS VERY DANGEROUS.
* New path mappings can be added using the WebRequestPathInfoRouter hook
  and adding paths to the PathRouter.
* (bug 32666) Special:ActiveUsers now allows a subpage to be used as value for the
  "target" query parameter (eg. Special:ActiveUsers/Username).
* New JavaScript variable wgPageContentLanguage.
* Added new debugging toolbar, enabled with $wgDebugToolbar.
* Differences in the history page now uses slightly better colors for people
  perceiving colors differently.
* (bug 32879) Upgrade jQuery to 1.7.1.
* jQuery UI upgraded to 1.8.17.
* Extensions can use the 'Language::getMessagesFileName' hook to define new
  languages using messages files outside of core.
* (bug 32512) Add 'Associated namespace' checkbox to Special:Contributions.
* Added $wgSend404Code, true by default, which can be set to false to send a
  200 status code instead of 404 for nonexistent articles.
* (bug 33447) Link to the broken image tracking category from Special:Wantedfiles.
* (bug 27724) Add timestamp to job queue.
* (bug 30339) Implement SpecialPage for running javascript tests. Disabled by default, due to
  tests potentially being harmful, not to be run on a production wiki.
  Enable by setting $wgEnableJavaScriptTest to true.
* Extensions can use the RequestContextCreateSkin hook to override what skin is
  loaded in some contexts.
* (bug 33456) Show $wgQueryCacheLimit on cached query pages.
* (bug 10574) Add an option to allow all pages to be exported by Special:Export.
* mediawiki.js Message object constructor is now publicly available as mw.Message.
* (bug 29309) Allow CSS class per tooltip (tipsy).
* (bug 33565) Add accesskey/tooltip to submit buttons on Special:EditWatchlist.
* (bug 17959) Inline rendering/thumbnailing for Gimp XCF images.
* (bug 27775) Namespace has it's own XML tag in the XML dump file.
* (bug 30513) Redirect tag is now resolved in XML dump file.
* sha1 xml tag added to XML dump file.
* (bug 33646) Badtitle error page now emits a 400 HTTP status.
* Special:MovePage now has a dropdown menu for namespaces.
* (bug 34420) Special:Version now shows git HEAD sha1 when available.
* (bug 33952) Refactor mw.toolbar to allow dynamic additions at any time.

=== Bug fixes in 1.19 ===
* $wgUploadNavigationUrl should be used for file redlinks if.
  $wgUploadMissingFileUrl is not set. The first was used for this
  until the second was introduced in 1.17.
* BREAKING CHANGE:  Style rules for wikitable are now more specific and prevent
  inheritance to nested tables which caused various issues (bug 30485 and bug
  33434). If your wiki has overridden rules for ".wikitable", please revise them and
  adjust where necessary. For comparison, use the "table.wikitable" section in
  skins/common/shared.css as base.
* $wgUploadNavigationUrl is now used for file redlinks if
  $wgUploadMissingFileUrl is not set. The former was used for this until the
  second was introduced in 1.17.
* (bug 27894) Move 'editondblclick' event listener down from body to
  div#bodyContent.
* (bug 30172) The check for posix_isatty() in maintenance scripts did not detect
  when the function exists but is disabled. Introduced
  Maintenance::posix_isatty().
* (bug 30264) Changed installer-generated LocalSettings.php to use
  require_once() instead require() for included extensions.
* Do not convert text in the user interface language to another script.
* (bug 26283) Previewing user JS/CSS pages didn't load other user JS/CSS pages.
* (bug 26486) ResourceLoader modules with paths to nonexistent files cause PHP
  warnings/notices to be thrown.
* (bug 30335) Fix for HTMLForms using GET that were breaking when non-friendly
  URLs are used.
* (bug 28649) Preventing half truncated multi-byte unicode characters when
  truncating log comments.
* Show --batch-size option in help of maintenance scripts that support it.
* (bug 4381) Magic quotes cleaning was not comprehensive, key strings were not
  unescaped.
* (bug 23057) Importers no longer can 'edit' or 'create' a fully-protected page by
  importing a new revision into it.
* Allow moving the associated talk pages of subpages even if the base page
  has no subpage.
* Per page edit-notices now work in namespaces without subpages enabled.
* (bug 31081) $wgEnotifUseJobQ is no longer unconditionally enqueueing jobs.
* (bug 30202) File names are now restricted on upload to 240 bytes, because of
  restrictions on some of the database fields.
* Timezones are now recognised in user preferences when offset is different
  due to DST.
* (bug 31692) "summary" parameter now also works when undoing revisions.
* (bug 18823) "move succeeded" text displayed bluelinks even when redirect was
  suppressed.
* (bug 19186) Special:UserLogin's title on Special:SpecialPages now says
  "create account" when the user cannot create an account.
* (bug 31818) 'usercreated' message now supports GENDER.
* (bug 32022) Our phpunit.php script can now be executed from another directory.
* (bug 26020) Setting $wgEmailConfirmToEdit to true no longer removes diffs
  from recent changes feeds.
* (bug 30232) add current time to message wlnote on Special:Watchlist.
* (bug 29110) $wgFeedDiffCutoff did not affect new pages.
* (bug 32168) Add wfRemoveDotSegments for use in wfExpandUrl.
* (bug 32358) Do not display "No higher resolution available" for dimensionless
  files (like audio files).
* (bug 32168) Add wfAssembleUrl for use in wfExpandUrl.
* (bug 32168) fixed - wfExpandUrl expands dot segments now.
* (bug 31535) Upload comments now truncated properly, and don't have brackets.
* (bug 32086) Special:PermanentLink now shows an error message when no subpage
  was specified.
* (bug 30368) Special:Newpages now shows the new page name for moved pages.
* (bug 1697) The way to search blocked usernames in block log should be clearer.
* (bug 29747) eAccelerator shared memory caching has been removed since it is
  now disabled by default and is buggy. APC, XCache and WinCache are not affected.
* Installer now refuses to install if php was not compiled with Ctype support.
* (bug 29475) Remove "trackback" feature entirely from core.
* (bug 32665) Special:BlockList prefills the username in the input field if
  using the Special:BlockList/username URL.
* (bug 27721) Make JavaScript variables wgSeparatorTransformTable and
  wgDigitTransformTable depend on page content language so the sort script
  sorts correctly more often.
* (bug 32230) Expose wgRedirectedFrom in JavaScript.
* (bug 31212) History tab not collapsed when the screen is narrow.
* (bug 15521) Use new section summary when the action of adding a new section
  also happens to create the page.
* (bug 32960) Remove EmailAuthenticationTimestamp from database when a
  email address is removed.
* (bug 32414) Empty page get a empty bytes attribute in Export/Dump.
* (bug 33101) Viewing a User or User talk of username resembling IP ending
  with .xxx causes Internal error.
* Warning about undefined index in certain situations when $wgLogRestrictions
  causes the first log type requested to be removed but not the others.
* Use separate message ('prefixindex-namespace') for title of
  Special:PrefixIndex rather then re-using Special:AllPages's allinnamespace.
* (bug 33156) Special:Block now allows you to confirm you want to block yourself
  when using non-normalized username.
* (bug 33246) News icon shown for news:// URLs but not for news: URLs.
* (bug 33305) Make mw.util.addCSS resistant to IE's @font-face bug by setting
  cssText after DOM insertion.
* (bug 30711) When adding a new section to a page with section=new, the text is
  now always added to the current version of the page.
* (bug 31719) Fix uploads of SVGs exported by Adobe Illustrator by expanding
  XML entities correctly.
* (bug 30914) Embeddable ResourceLoader modules (user.options, user.tokens)
  should be loaded in <head> for proper dependency resolution.
* (bug 32702) Removed method Skin::makeGlobalVariablesScript() has been readded
  for backward compatibility.
* (bug 31469) Make sure tracking category messages expand variables like
  {{NAMESPACE}} relative to correct title.
* (bug 33454) ISO-8601 week-based year number (format character 'o') is now
  calculated correctly with respect to timezone.
* (bug 32219) InstantCommons now fetches content from Wikimedia Commons using
  HTTPS when the local wiki is served over HTTPS.
* (bug 33525) clearTagHooks doesn't clear function hooks.
* (bug 33523) Function tag hooks don't appear on Special:Version.
* Files with IPTC blocks we can't read no longer prevent extraction of exif
  or other metadata.
* (bug 33587) Remove action "historysubmit" from history pages.
* (bug 25800) mw.config wgAction should contain the actually performed action instead
  of whatever the query value contains.
* (bug 4438) Add CSS hook for current WikiPage action.
* (bug 33703) Common border-bottom color for <abbr> should inherit default (text) color.
* (bug 33819) Display file sizes in appropriate units.
* (bug 32948) {{REVISIONID}} and related variables are no longer blank after doing
  a null edit.
* (bug 33880) $wgUsersNotifiedOnAllChanges should not send e-mail to user who made
  the edit.
* (bug 33902) Decoding %2B with mw.Uri.decode results in ' ' instead of +.
* (bug 33762) QueryPage-based special pages no longer misses *-summary message.
* Other sizes links are no longer generated for wikis without a 404 thumbnail handler.
* (bug 29454) Enforce byteLimit for page title input on Special:MovePage.
* (bug 34114) CSSMin::remap() doesn't respect its $embed parameter.
* Special:Contributions/newbies now shows the contributions for the user "newbies".
  New user contributions are obtained using the form or using ?contribs=newbie in URL.
* It is now possible to delete images that have no corresponding description pages.
* (bug 33165) GlobalFunctions.php line 1312: Call to a member function
  getText() on a non-object.
* (bug 31676) Group dynamically inserted CSS into a single <style> tag, to work
  around a bug where not all styles were applied in Internet Explorer.
* (bug 28936, bug 5280) Broken or invalid titles can't be removed from watchlist.
* (bug 34600) Older skins using useHeadElement=false were broken in 1.18.
* (bug 34604) [mw.config] wgActionPaths should be an object instead of a numeral
  array.
* (bug 12262) Indents and lists are now aligned
* (bug 29753) mw.util.tooltipAccessKeyPrefix should be alt-shift for Chrome
   on Windows
* (bug 25095) Special:Categories should also include the first relevant item
   when "from" is filled.
* (bug 34972) An error occurred while changing your watchlist settings for
  [[Special:WhatLinksHere/Example]]

=== API changes in 1.19 ===
* Made action=edit less likely to return "unknownerror", by returning the actual error
  message (which may have come from a hook call or similar).
* (bug 19838) siprop=interwikimap can now use the interwiki cache.
* (bug 29748) Add API search prefix support.
* (bug 29684) Set forgotten parameter types in ApiQueryIWLinks.
* (bug 29685) do not output NULL parentid with list=deletedrevs&drprop=parentid.
* siprop=interwikimap and siprop=languages can use silanguagecode to have
  a best effort language name translation. Use CLDR extension for best result.
* (bug 30230) action=expandtemplates should not silently override invalid title
  inputs.
* (bug 18634) Create API to fetch MediaWiki's language fallback tree structure.
* (bug 26885) Allow show/hide of account blocks, temporary blocks and single IP
  address blocks for list=blocks.
* (bug 30591) Add support to only return keys in ApiAllMessages.
* The API now respects $wgShowHostnames and won't share the hostname in
  servedby if it's set to false.
* wlexcludeuser parameter added to ApiFeedWatchlist.
* (bug 7304) Links on redirect pages no longer cause the redirect page to show
  up as a redirect to the linked page on Special:Whatlinkshere.
* (bug 32609) API: Move captchaid/captchaword of action=edit from core
  to Captcha extension(s).
* Added 'APIGetDescription' hook.
* (bug 32688) Paraminfo for parameter "generator" of the query module shows too
  many types.
* (bug 32415) Empty page get no size attribute in API output.
* (bug 31759) Undefined property notice in querypages API.
* (bug 32495) API should allow purge by pageids.
* (bug 33147) API examples should explain what they do.
* (bug 33482) Api incorrectly calls ApiBase::parseMultiValue if allowed
  values is given as an array.
* (bug 32948) {{REVISIONID}} and related variables are no longer blank after
  calling action=purge&forcelinkupdate.
* (bug 34377) action=watch now parses messages using the correct title instead
  of "API".
* (bug 35036) WikiLove messages were not automatically updated in JavaScript
  after having been changed on-wiki due to a bug in core

=== Languages updated in 1.19 ===

MediaWiki supports over 350 languages. Many localisations are updated
regularly. Below only new and removed languages are listed, as well as
changes to languages because of Bugzilla reports.

* Canadian English (en-ca) (new).
* Norwegian (bokmål) (nb) (renamed from no).
* Uighur (Latin) (ug-latn) was incorrectly marked as right-to-left language.
* (bug 30217) Make pt-br a fallback of pt.
* (bug 31193) Set fallback language of Assamese from Bengali to English.
* Update date format for dsb and hsb: month names need the genitive.
* (bug 28643) Serbian variant conversion improvements (Nikola Smolenski).
* (bug 29405, bug 30809) Lower diacritics are invisible in titles in Indic
  languages Assamese, Bengali, Hindi, Malyalam and Odiya.
* (bug 32826) Titles in indic languages are partially cut.
* (bug 33367) Gendered namespaces for Czech.
* (bug 33014) Language::formatSize()/formatBitrate() should be able to deal
  with larger numbers (tera-yotta).

=== Other changes in 1.19 ===
* BREAKING CHANGE: Legacy global array 'ta' and global function 'akeytt' have
  been removed from wikibits.js.
* jquery.mwPrototypes module was renamed to jquery.mwExtension.
* The maintenance script populateSha1.php was renamed to the more concise
  populateImageSha1.php.
* The Client-IP header is no longer checked for when trying to resolve a client's
  real IP address.
* (bug 22096) Although IE5.x and below was already unsupported officially, stylesheets
  existing exclusively for IE5.0 and IE5.5 have now been removed (which were in skins
  'chick' and 'monobook').
* The constructor for CategoryView has changed, the second parameter is now a
  Context source and is required.
* The Title::escape{Local,Full,Canonical}URL methods are deprecated, please use
  proper html building methods to escape the normal get{...}URL methods instead.
* The $variant arguments in the Title::get{Local,Full,Link,Canonical}URL methods
  have been replaced with a secondary query argument.
* The $variant argument in the hooks for the Title::get{Local,Full,Link,Canonical}URL
  methods have been removed, the variant is now part of the $query argument.
* Removed Title::isValidCssJsSubpage(), deprecated since 1.17 in favor of
  using Title::isCssJsSubpage() or checking Title::isWrongCaseCssJsPage().
* Support for the deprecated hook MagicWordMagicWords was removed.
* The Xml::namespaceSelector method has been deprecated, please use
  Html::namespaceSelector instead (note that the parameters have changed also).
* (bug 33746) Preload popular ResourceLoader modules (mediawiki.util) as stop-gap
  for scripts missing dependencies.
  New configuration variable $wgPreloadJavaScriptMwUtil has been introduced for this
  (set to false by default for new installations). Set to true if your wiki has a large
  amount of user/site scripts that are lacking dependency information. In the short to
  medium term these user/site scripts should be fixed by adding the used modules to the
  dependencies in the module registry and/or wrapping them in a callback to mw.loader.using.

== MediaWiki 1.18 ==

== MediaWiki 1.18.5 ==
2012-08-30

This is a security release of the MediaWiki 1.18 branch

=== Changes since 1.18.4 ===
* (bug 39700) File: link to non-existing file can inject html
* (bug 39823) Hidden block text leaking to admins
* (bug 39184) LDAP password leakage
* (bug 39180) Disallow framing of api results
* (bug 37587) Enforce language codes to be html safe
* (bug 39824) Check global blocks on account creation

== MediaWiki 1.18.4 ==
2012-06-12

This is a security release of the MediaWiki 1.18 branch.

=== Changes since 1.18.3 ===
* (bug 36938) Correctly escape uselang attribute to prevent xss
* Expanded Blacklist for SVG Files

== MediaWiki 1.18.3 ==
2012-04-25

This is a maintenance release of the MediaWiki 1.18 branch.

=== Changes since 1.18.2 ===
* (bug 35446) Using "{{nse:}}" with an invalid namespace name no longer throws
  a PHP warning.
* (bug 35567) The whole password reminder e-mail is now sent in the same language.
* (bug 35961) Hash comparison should always be strict.
* (bug 35671) PHP Notice: Undefined index: gettoken in includes/api/ApiMain.php
  on line 598.
* Fix broken email confirmation expiration caused by MWCryptRand changes.

== MediaWiki 1.18.2 ==
2012-03-21

This is a maintenance and security release of the MediaWiki 1.18 branch.

=== Changes since 1.18.1 ===
* (bug 33686) could not get a list of contributors for an article when using
  a SQLite database.
* (Bug 33865) Exception thrown in action=parse when attempting to use the title
  parameter without setting the text parameter.
* UserMailer could potentially throw a fatal error when a MailAddress object had
  an empty email address.
* (Bug 33087) Exchange server rejected mail sent by MediaWiki
* (bug 34528) Edit section tooltips show correction section name again
* (bug 34246) MediaWiki:Whatlinkshere-summary message is displayed again in
  Special:Whatlinkshere
* (bug 22555) Remove or skip strip markers from tag hooks like &lt;nowiki&gt; in
  core parser functions which operate on strings, such as formatnum.
* (bug 34212) ApiBlock/ApiUnblock allow action to take place without a token
  parameter present.
* (bug 34907) Fixed exposure of tokens through load.php that could have facilitated
  CSRF attacks.
* (bug 35317) CSRF in Special:Upload.

== MediaWiki 1.18.1 ==
2012-01-11

This a maintenance and security release of the MediaWiki 1.18 branch.

=== Changes since 1.18.0 ===
* (bug 32712) Fix for search indexing of pages with certain unicode chars following URL.
* (bug 3901) Lang, hreflang attribs added to sidebar interlanguage links for screen readers.
* (bug 30774) mediawiki.html: Add support for numbers and booleans in the
  attribute values and element contents.
* (bug 32473) [[Special:PasswordReset]] can not be used on private wiki.
* (bug 32853) Fixed CACHE_DBA object cache type.
* (bug 32786) Backward compatibility for extension using 1.17's Database::newFromType().
* Fixed exception when using Special:WhatLinksHere on a Media: file.
* (bug 32709) Private Wiki users were always taken to Special:Badtitle on login.
* (bug 33240) Sort images are missing but referenced in css.
* (bug 31921) Magic words REVISIONDAY, REVISIONMONTH and REVISIONYEAR were
  not showing their values on preview.
* (bug 32702) Removed method Skin::makeGlobalVariablesScript() has been readded
  for backward compatibility.
* (bug 30172) The check for posix_isatty() in maintenance scripts did not detect
  when the function exists but is disabled. Introduced Maintenance::posix_isatty().
* (bug 33305) Make mw.util.addCSS resistant to IE's @font-face bug by setting
  cssText after DOM insertion.
* (bug 29102) Upgrades no longer fail with the error "Unknown character set: 'mysql4'.
* (bug 25355) Parser generates edit section links for special pages.
* (bug 33321) Adding a line to MediaWiki:Sidebar that contains a pipe, but doesn't
  have any pipes after being transformed by MessageCache, causes exception on
  all pages.
* Fixed recentchanges FK violation on page delete and cache purge error in updater
  for Oracle DB.
* (bug 33117) prop=revisions allows deleted text to be exposed through cache pollution.

== MediaWiki 1.18.0 ==
2011-11-24

This is the first stable release of the MediaWiki 1.18 branch.

=== Summary of selected changes in 1.18 ===

Selected changes since MediaWiki 1.17 that may be of interest:

* Some of the more commonly used MediaWiki extensions are now included in the
  release tarball. These extensions are ConfirmEdit, Gadgets, Nuke, ParserFunctions,
  Renameuser, Vector and WikiEditor.

* Gender support has been improved, meaning user pages can display the correct gender
  variant of "User" can now be used.

* MediaWiki can now detect the camera orientation of an image from the Exif metadata, and
  can rotate the image thumbnail appropriately. Metadata support has been generally
  improved, and can now extract IPTC and XMP metadata.

* Improved directionality support in 1.18 means that MediaWiki is better to use for
  RTL users.

* MediaWiki now supports protocol - relative URLs in links, interwiki targets and $wgServer

* Math support has been removed from core

=== Changes since 1.18.0rc1 ===
* (bug 32228) regression in Special:Search which did not conserve profile on new search
* (bug 32460) Categories were improperly aligned in Simple and CologneBlue
* (bug 32412) TOC links on [[Special:EditWatchlist]] points to the fieldsets
* (bug 32582) Fix TOC show/hide link regression on IE 8

=== Changes since 1.18 beta 1 ===
* (bug 31886) Wrong titles redirecting to Special:Badtitle in the 1.18 deployment.
* (bug 32051) Fix description for wlprop=sizes.
* (bug 31913) Special:MostLinkedTemplates had an incorrect GROUP BY clause
  under Microsoft SQL.
* (bug 32100) installer complains about suhosin GET limit.
* (bug 31933) fix 1.18 regression in Monobook sidebar: huge spacing between portlets
  on IE 7 and IE 8/9 in compatibility view.
* (bug 32126) Fix 1.18 regression in watchlist editor when items already removed
  from watchlist.
* (bug 32183) remove the client-* classes added from user-agent-sniffing onto
  the <html> element.
* (bug 29912) Unit tests break if parsertest tables are still present.
* (bug 31694) During installation, tabbing order (cursor focus) goes to logo
  instead of 'continue'.
* (bug 29102) Upgrade fails "Unknown character set: 'mysql4".
* (bug 31990) justify paragraphs pref adds extra space to category listing.
* (bug 20148) Better title for [[Special:Disambiguations]] page.
* (bug 31502) TOC is missing on Special:EditWatchlist.
* (bug 32256) API list=search stops at first invalid result.
* (bug 32047) jquery.tablesorter.js: thead is before caption.
* (bug 29854) Store protocol-relative links twice in the externallinks table,
  one with http: in el_index and once with https.
* (bug 31822) Error during upgrade due to output buffer reset in stdout.

=== Configuration changes in 1.18 ===
* The WantedPages::getSQL hook has been removed and replaced with
  WantedPages::getQueryInfo. This may break older extensions.
* The SkinTemplateBuildContentActionUrlsAfterSpecialPage,
  SkinTemplateContentActions and SkinTemplateTabs hooks have been removed in
  favor of SkinTemplateNavigation and SkinTemplateNavigation::SpecialPage.
* $wgUseCombinedLoginLink controls whether to output a combined
  login / create account link in the personal bar, or to output separate login
  and create account links.
* Skin names are no longer created based on a ucfirst version of the key in
  $wgValidSkinNames but now the value. This means for
  $wgValidSkinNames["monobook"] = "MonoBook"; the skin loader will no longer try
  loading SkinMonobook and will instead load SkinMonoBook.
* $wgMaxUploadSize may now be set to an array to specify the upload size limit
  per upload type.
* $wgAPICacheHelp added in 1.16 is now removed. To disable API help caching, set
  $wgAPICacheHelpTimeout = 0;
* OutputPage::isUserJsAllowed() no longer returns false when scripts are allowed
  by the page, but $wgAllowUserJs is set to false.
* Pure "Skin" class based custom skins are no longer supported, all custom skins
  should be put together using SkinTemplate and BaseTemplate or QuickTemplate.
* The transliteration for passwords in case they were migrated from an old
  Latin-1 install (previous to MediaWiki 1.5) is now only done for wikis with
  $wgLegacyEncoding set.
* (bug 27508) Add $wgSVGMetadataCutoff to limit the maximum amount of an SVG we
  look at when finding metadata to prevent excessive resource usage.
* $wgSysopUserBans and $wgSysopRangeBans (deprecated in 1.17) are now removed.
  Use $wgBlockCIDRLimit = array( 'IPv4' => 43, 'IPv6' => 128 ) to achieve the
  same functionality as $wgSysopRangeBans; you can use the BlockIp hook to
  replicate $wgSysopUserBans functionality.
* The options on the block form have been standardised such that checking a box
  makes the block 'more serious'; so while "check to prevent account creation"
  and "check to enable autoblock" remain the same, "check to allow user-talk
  edit" is reversed to "check to *disable* user-talk edit", and "check to block
  anon-only" becomes "check to block logged-in users too".  The default settings
  remain the same.
* Most of the field names on the Special:Block form have been changed, which
  will probably break screen-scraping bots.
* (bug 26866) The 'trackback' right is no longer granted to sysops by default.
  $wgUseTrackbacks is already false by default.
* (bug 17009) the hiddenStructure CSS class, a highly hackish way of at least
  *appearing* to hide article elements, has been removed.  Use the
  ParserFunctions extension to actually remove unwanted elements from the
  output.
* (bug 14202) $wgUseTeX has been superseded by the Math extension. To re-enable
  math conversion after upgrading, obtain the Math extension from SVN or from
  https://www.mediawiki.org/wiki/Extension:Math and add to LocalSettings.php:
  require_once "$IP/extensions/Math/Math.php";
* $wgProfiler is now a configuration array, see StartProfiler.sample for
  details.
* $wgProfiling has been removed.
* The spyc library is now no longer included in phase3.
* (bug 28343) Unused preferences contextlines/contextchars have been removed
* $wgSkinExtensionFunctions has been removed. Use $wgExtensionFunctions instead.
* $wgProto has been removed. You now only need to set $wgServer to change the
  URL protocol.
* $wgRateLimitsExcludedGroups (deprecated in 1.13) has been removed.
* $wgInputEncoding and $wgOutputEncoding (deprecated in 1.5) have now been removed.
* $wgAllowUserSkin (deprecated in 1.16) has now been removed.
* $wgExtraRandompageSQL (deprecated in 1.16) has now been removed.
* LogReader and LogViewer classes (deprecated in 1.14) have now been removed.
* (bug 26033) Added $wgArticleCountMethod to select the method to use to say
  whether a page is an article or not. $wgUseCommaCount is now deprecated.
* $wgEnableDublinCoreRdf and $wgEnableCreativeCommonsRdf no longer work in core,
  and the functionality has been moved to the relevant extensions. See
  https://www.mediawiki.org/wiki/Extension:DublinCoreRdf and
  https://www.mediawiki.org/wiki/Extension:CreativeCommonsRdf as appropriate.
* (bug 21107) Split error "customcssjsprotected" into separate messages for JS and CSS
* Removed $wgCheckCopyrightUpload from DefaultSettings, since the relevant feature
  was removed in about 1.5.
* LogPageValidTypes, LogPageLogName, LogPageLogHeader and LogPageActionText
  hooks have been removed.
* New hook "Collation::factory" to allow extensions to create custom
  category collations.
* $wgGroupPermissions now supports per namespace permissions.
* $wgEnableAutoRotation enables or disables auto-rotation. Leaving it set to
  null will cause MediaWiki to determine if auto-rotation is available.

=== New features in 1.18 ===
* BREAKING CHANGE: action=watch / action=unwatch now requires a token.
* BREAKING CHANGE: Article class hierarchy split into WikiPage (backend)
  and Article (frontend) hierarchies. Several hooks now pass a WikiPage object instead
  of an Article object. These hooks all use an $article parameter as documented in hooks.txt.
  Extensions should be updated to account for this, though most won't require any changes.
* (bug 27860) Minor edit after clicking 'new section' tab
  Now the "This is a minor edit" checkbox is not available when you
  create a page or new section.
* (bug 8130) Query pages should limit to content namespaces, not just main
  namespace.
* Special:Contribs now redirects to Special:Contributions.
* (bug 6672) Images are now autorotated according to their EXIF orientation.
  This only affects thumbnails; the source remains unrotated.
* (bug 25708) Update case mappings and normalization to Unicode 6.0.0.
* New hook ArticlePrepareTextForEdit added, called when preparing text to be
  saved.
* New parser option PreSaveTransform added, allows the pre-save transformation
  to be selectively disabled.
* Alternative to $wgHooks implemented, using the new Hooks class.
* Add width parameter to Special:Filepath to allow getting the file path of a
  thumbnail.
* (bug 26870) Add size to {{filepath:}}.
* Upload warnings now show a thumbnail of the uploaded file.
* Introduced the edittools-upload message, which will be inserted under the
  upload form instead of edittools if available.
* (bug 26285) Extensions will be automatically generated on upload if the user
  specified a filename without extension.
* (bug 26851) Special:UserRights now allows to prefill the reason field
* New maintenance script to fix double redirects
  (maintenance/fixDoubleRedirects.php).
* (bug 23315) New body classes to allow easier styling of special pages.
* (bug 27159) Make email confirmation code expiration time configurable.
* (bug 29047) CSS/JS for each user group is imported from MediaWiki:Group-sysop.js,
  MediaWiki:Group-autoconfirmed.css, etc.
* (bug 24230) Uploads of ZIP types, such as MS Office or OpenOffice can now be
  safely enabled. A ZIP file reader was added which can scan a ZIP file for
  potentially dangerous Java applets. This allows applets to be blocked
  specifically, rather than all ZIP files being blocked.
* (bug 2429) Allow selection of associated namespace in recent changes.
* (bug 26217) File size is now checked before uploading in HTML5 browsers.
* CSS stylesheet MediaWiki:Noscript.css is now loaded for users with JavaScript
  disabled (enclosed in the head in a <noscript> tag).
* Added UserGetLanguageObject hook to change the language used in $wgLang.
* (bug 14645) When $wgMiserMode is on, expensive special pages are styled
  differently (italicized by default) on Special:SpecialPages.
* Added $wgAggregateStatsID, which allows UDP stats to be aggregated over
  several wikis.
* When $wgAllowMicrodataAttributes is true, all itemtypes are allowed, not just
  the three that were defined in the original specification.
* (bug 14706) Added support for the Imagick PHP extension.
* (bug 18691) Added support for SVG rasterization using the Imagick PHP
  extension.
* (bug 2581, bug 6834) Added links to thumbnail in several resolutions to the
  file description page. The sizes are set by $wgImageLimits.
* (bug 28031) Add pageCount support to ArchivedFile.
* (bug 27924) PhpHttpRequest doesn't return response body if HTTP != 200.
* Added hook BitmapHandlerTransform to allow extension to transform a file
  without overriding the entire handler.
* The parser now attempts to output markers for editsection tokens and defer the
  rendering of them post-cache to reduce parser cache fragmentation and ensure
  skin customizability of edit section links.
* (bug 24755) AuthPlugin auto-creation of local accounts can now be aborted by
  other extensions by handling the 'AbortAutoAccount' hook, similar to the
  'AbortNewAccount' triggered by explicit account creations. (They are separate
  to avoid loops and confusion; auth plugins like CentralAuth need to handle
  AbortNewAccount separately.
* Special:ListFiles is now transcludable.
* (bug 13879) Special:Emailuser asks for suitable target user if called without.
* (bug 16956) IPTC and XMP metadata now extracted from images.
* (bug 23816) A tracking category is now added for any pages with broken images.
* (bug 23495) Allow createAndPromote.php to create non-sysop users.
* (bug 28916) A way to to toggle mw.config legacy globals settings from
  LocalSettings.php has been created by introducing $wgLegacyJavaScriptGlobals.
* (bug 28503) Support for ircs:// URL protocols.
* (bug 26033) It is now possible to count all non-redirect pages in content
  namespaces as articles.
* Images can now be embedded in an XML dump stream using backupDump.php
  --include-files and can be imported using importDump.php --uploads;
  furthermore, it can import files from the filesystem using --image-base-path.
* Three new hooks in Special:Undelete, 'UndeleteForm::showHistory',
  'UndeleteForm::showRevision' and 'UndeleteForm::undelete', so that extensions
  may override the usage of PageArchive class and replace it with their own
  class that extends PageArchive.
* (bug 28915) Implement QUnit test suite for MediaWiki JavaScript.
  Also built-in support for distribution through a TestSwarm instance.
* (bug 29036) For cascade-protected pages, the mw-textarea-cprotected class is
  added to the textarea on the edit form.
* mw.util.wikiScript has been implemented (like wfScript in GlobalFunctions.php)
* (bug 29067) Expose user.tokens (like we do user.options) in ResourceLoader.
* New 'Debug' hook used by wfDebug() and wfDebugLog().
* (bug 27655) Require token for watching/unwatching pages)
* (bug 28904) (bug 29773) Update jQuery version from 1.4.4 to 1.6.2 (the latest version)
* (bug 29441) Expose CapitalLinks config in JS to allow modules to properly
  handle titles on case-sensitive wikis.
* (bug 29397) Implement mw.Title module in core.
* In MySQL 4.1.9+ with replication enabled, fetch the slave lag from SHOW SLAVE
  STATUS instead of SHOW PROCESSLIST. This ensures that lag is reported
  correctly in the case where there are no write events occurring. Note that
  the DB user now needs to have the REPLICATION CLIENT privilege if you are
  using replication.
* Language codes in $wgDummyLanguageCodes are now excluded on localization
  statistics (maintenance/language/transstat.php).
* (bug 29586) Make the (next 200) links on categories link directly to
  the relevant section of the category.
* (bug 29109) Allow the automatic edit summary for redirect creation
  show the first bit of the new redirect page.
* (bug 29723) mw.util.wikiGetlink() now defaults to wgPageName.
* (bug 29680) Add GetDefaultSortkey hook to override the default sortkey.
* (bug 16699) {{#language:}} accepts second parameter to specify the language in
  which the language name is wanted. Coverage depends on the cldr extension.
* (bug 15802) An easy way to look up messages: language qqx which returns
  the message keys.
* (bug 29868) Add support for passing parameters to mw.msg in jquery.localize.
* (bug 29558) $wgMiserMode now disables update.php by default.
* AjaxCategories: Easily add, edit or delete categories on article pages.
  Suggests possible categories when typing, all saves are done via AJAX.
  Supports editing of multiple categories and then saving them in one batch.
* $wgAutopromoteOnce was added, allowing for users to be automatically promoted
  to explicit usergroups. If a group is removed from a user via Special:UserRights,
  it will not automatically be re-added. Configuration is similar to
  $wgAutopromote (see DefaultSettings.php).
* The PerformRetroactiveAutoblock hook was added to allow overriding or complementing
  retroactive autoblock handling. This runs when blocking a user with the 'autoblock' option.
* MediaWiki now supports using protocol-relative URLs in links, interwiki
  targets and $wgServer.
* Introduced $wgVaryOnXFPForAPI which will cause the API to send
  Vary: X-Forwarded-Proto headers.
* New maintenance script to refresh image metadata (maintenance/refreshImageMetadata.php).
* (bug 16428) Include permalink in printable version.
* (bug 30722) Add an identity collation that sorts things based on what the
  unicode code point is (aka pre-1.17 behavior).
* (bug 30940) Add a hook in User:getDefaultOptions.
  To give extensions a better and more flexible way of providing default
  values for preferences a hook has been introduced in User:getDefaultOptions().
  Setting preferences in $wgDefaultUserOptions still work fine, but when reading
  them (i.e. with array_keys) to get a list of all preferences, then
  $wgDefaultUserOptions should no longer be used as it will contain those set via
  User:getDefaultOptions().
* (bug 30497) Add client-nojs and client-js classes on document element
  to let styles easily hide or show things based on general JS availability.
* (bug 31293) If Special:Userlogin is loaded over HTTPS, display
  MediaWiki:loginend-https instead of MediaWiki:loginend, if it's not empty.
  Same for signupend on the account creation page.
* (bug 31233) New OutputPage::addJsConfigVars() method to make the output page specific
  mw.config map extendable.
* mw.util.wikiScript has been implemented (like wfScript in GlobalFunctions.php).

=== Bug fixes in 1.18 ===
* (bug 27860) Minor edit after clicking 'new section' tab.
* (bug 23119) WikiError class and subclasses are now marked as deprecated.
* (bug 10871) Javascript and CSS pages in MediaWiki namespace are no longer
  treated as wikitext on preview.
* (bug 22753) Output from update.php is more clear when things changed, entries
  indicating nothing changed are now all prefixed by "...".
* Page existence is now not revealed (in the colour of the tabs) to users who
  cannot read the page in question.
* (bug 19006) {{REVISIONUSER}} no longer acts like {{CURRENTUSER}} in some
  cases.
* (bug 16019) $wgArticlePath = "/$1" no longer breaks API edit/watch actions.
* (bug 18372) File types blacklisted by $wgFileBlacklist will no longer be shown
  as "Permitted file types" on the upload form.
* (bug 26379) importImages.php gives more descriptive error message on failure.
* (bug 26410) + signs are no longer treated as spaces in internal links if
  link has a % sign in it.
* (bug 26412) Search results headers no longer show a bogus edit link.
* (bug 26540) Fixed wrong call to applyPatch in MysqlUpdater.
* (bug 26574) Added 'upload' to $wgRestrictionTypes, allowing upload protected
  pages to be queried via the API and Special:ProtectedPages, and allowing
  disabling upload protection by removing it from $wgRestrictionTypes.
* If an edit summary exceeds 250 bytes and is truncated, add an ellipse.
* (bug 26638) Database error pages display correctly in RTL languages.
* (bug 26187) Confirmrecreate no longer parses the edit summary.
* (bug 26208) Mark directionality of some interlanguage links.
* (bug 26034) Make the "View / Read" tab in content_navigation style tabs remain
  selected when the action is "purge".
* (bug 14267) Support a MediaWiki:Mainpage-nstab override for the subject
  namespace tab on the mainpage of a wiki.
* (bug 10158) Do not mention allowing others to contact you when the feature
  is disabled ($wgEnableUserEmail=false).
* (bug 26733) Wrap initial table creation in transaction.
* (bug 26729) Category pages should return 404 if they do not exist and have no
  members.
* (bug 2585) Image pages should send 404 if no image, no shared image and no
  description page.
* Custom editintro's using the editintro url parameter will no longer show
  <noinclude> sections on pages they are included on.
* (bug 26449) Keep underlines from headings outside of tables and thumbs by
  adding overflow:hidden to h1,h2,h3,h4,h5,h6 (also fixes editsection bunching).
* (bug 26708) Remove background-color:white from tables in Monobook and Vector.
* (bug 28422) Remove color:black from tables in Monobook and Vector. And add it
  to table.wikitable instead.
* (bug 26781) {{PAGENAME}} and related parser functions escape their output
  better.
* (bug 26716) Provide link to instructions for external editor related
  preferences and add a comment to the ini control file explaining what is
  going on.
* Trying to upload a file with no extension or with a disallowed MIME type now
  gives the right message instead of complaining about a MIME/extension
  mismatch.
* (bug 26809) Uploading files with multiple extensions where one of the
  extensions is blacklisted now gives the proper extension in the error message.
* (bug 26961) Hide anon edits in watchlist preference now actually works.
* (bug 19751) Filesystem is now checked during image undeletion.
* Send last modified headers for Special:Recentchanges when RC patrol is
  enabled, but user cannot see rc patrol links.
* (bug 26548) ForeignAPIRepo (InstantCommons) now works with PDF files
  and other multi-paged file formats.
* Files with a mime type that does not match the extension are now properly
  thumbnailed.
* (bug 27201) Special:WhatLinksHere output no longer contains duplicate IDs.
* (bug 15905) Nostalgia skin could become more usable by including a Talk:
  link at the top of the page.
* (bug 27560) Search queries no longer fail in Walloon language.
* (bug 27679) Broken embedded files with special characters are no longer
  double HTML escaped.
* (bug 27700) The upload protection can now also be set for files that do not
  exist.
* (bug 27763) Article::getParserOutput() no longer throws a fatal given when an
  incorrect revision ID is passed.
* Trim the form field for uploading by url to remove extra spaces which could
  cause confusing error messages.
* (bug 27854) Http::isValidURI is way too lax.
* Do not show enotifminoredits preference, if disabled by $wgEnotifMinorEdits.
* AbortLogin returning "ABORTED" now handled.  Also allows message identifier
  for "ABORTED" reason to be returned and displayed to user.
* (bug 28034) uploading file to local wiki when file exists on shared repository
  (commons) gives spurious info in the warning message.
* Usernames get lost when selecting different sorts on Special:listfiles.
* (bug 14005) editing section 0 of an existing but empty page gives no such
  section error.
* (bug 26939) Installer does not set $wgMetaNamespace.
* (bug 28166) UploadBase assumes that 'edit' and 'upload' rights are not per
  page restrictions.
* Make truncate function automatically consider length of '...' string,
  since length can vary by localization.
* (bug 28242) Make redirects generated by urls containing a local interwiki
  prefix be a 301 instead of a 302.
* (bug 15641) blocked administrators are now prevented from deleting or
  protecting their own talk page; and all blocked users are more
  comprehensively prevented from performing other actions.
* (bug 27893) Edit-on-doubleclick now applies only on view and purge actions;
  no longer triggers unexpectedly on delete, history etc.
* (bug 28417) Fix PHP notice when importing revision without a listed id.
* (bug 28430) Make html and TeX output of <math> always be left-to-right.
* (bug 28306) Fix exposure of suppressed usernames in ForeignDBRepo.
* (bug 28372) Fix bogus link to suppressed file versions in ForeignDBRepo.
* (bug 27473) Fix regression: bold, italic no longer interfere with linktrail
  for ca, kaa.
* (bug 28444) Fix regression: edit-on-doubleclick retains revision id again.
* &apos; character entity is now allowed in wikitext.
* UtfNormal::cleanUp on an invalid utf-8 sequence no longer returns false if
  intl installed.
* (bug 28561) The css class small will no longer make nested elements even
  smaller.
* (bug 13172) Array type exif data (like GPS) was not being extracted from
  images.
* (bug 28532) wfMsgExt() and wfMsgWikiHtml() use $wgOut->parse().
* (bug 16129) Transcluded special pages expose strip markers when they output
  parsed messages.
* (bug 27249) "Installed software" table in Special:Version should always be
  left-to-right.
* (bug 28719) Do not call mLinkHolders __destruct explicitly.
* (bug 21196) Article::getContributors() no longer fails on PostgreSQL.
* (bug 28752) XCache doesn't work in CLI mode.
* (bug 28076) Thumbnail height limited to 360 pixels on Special:Listfiles.
* (bug 22227) Special:Listfiles no longer throws an error on bogus file entries.
* (bug 19408) user_properties.up_property: 32 bytes is not enough.
* (bug 25262) Fix for minification of hardcoded data: URIs in CSS.
* (bug 29263) Add LTR class to the shared CSS to be used for left-to-right text
  such as SQL queries shown in dberrortext and similar messages in RTL
  environments.
* (bug 14977) Fixed $wgServer detection in cases where an IPv6 address is used
  as the server name.
* The View X deleted revisions is now shown again on Special:Upload.
* (bug 29071) mediawiki.action.watch.ajax.js should pass uselang to API.
* (bug 28868) Show total pages in the subtitle of an image on the
  file description page for multi-paged documents.
* (bug 28883) Message names for different compression types commonly
  used in Tiff files.
* When transcluding a special page, do not let it interpret url parameters.
* (bug 28887) Special page classes are no longer re-used during 1 request.
* (bug 28888) Searching for something starting with a # sign no longer tells
  the user a page named [[:]] already exists.
* (bug 23002) Imagelinks table not updated after imagemove.
* (bug 27864) Transcluding {{Special:Prefix}} with empty prefix now lists all
  pages.
* (bug 18803) JPEG2000 images should not be uploadable as .jpg files.
* (bug 11868) If using links to count articles, the checking will now be based
  on the real presence of an internal link instead of the "[[" string.
* (bug 28287) The "your changes" box for edit conflicts is now read-only.
* (bug 28940) When making a thumb of an SVG, and only specifying the height
  make the width be the max SVG size, not the natrual width of the SVG.
* (bug 1780) Uploading files with non-ascii characters are now forbidden on
  Windows.
* (bug 23464) File: prefixes are now chopped off during uploading.
* (bug 28174) Message config-logo-help amended to not explicitly assume any
  LTR/RTL screen layout.
* (bug 28992) Revision numbers in the patrol log are transformed in the user
  language.
* (bug 27073) ResourceLoaderDynamicStyles marker should be dynamically appended to
  the document head if it doesn't exist.
* (bug 27023) After the document is ready, mw.loader is broken (calls callback
  before module is parsed).
* (bug 4330) External URLs without a custom title should be treated as LTR,
  even in RTL text.
* (bug 29055) Make "don't send email on minor edits" preference apply to
  changes to talk page in addition to watchlist edits.
* (bug 28272) Special:AllMessages should have only one "Go" button.
* (bug 29101) Special:FileDuplicateSearch no longer shows silly message.
* (bug 29048) jQuery.tabIndex: firstTabIndex() should not output the same
  as lastTabIndex().
* (bug 29332) Warn if user requests mediawiki-announce subscription but does not
  enter an e-mail address.
* (bug 25375) Add canonical namespaces to "wgNamespaceIds" in mw.config.
* The class JpegOrTiffHandler was renamed ExifBitmapHandler.
* (bug 29443) Special:Undelete should use JavaScript to invert all checkboxes
  instead of reloading the page.
* (bug 29325) Setting $wgStrictFileExtensions to false no longer gives incorrect warning.
* (bug 29437) Multiple apostrophes in deleted article title cause odd rendering.
* (bug 29485) RSS feed of Special:RecentChange grouped together multiple
  consecutive edits by same user in included diff, but then linked to
  a single ungrouped diff.
* Do not try to group together a page creation and edit in the RSS feed of RC.
* (bug 29342) Patrol preferences shouldn't be visible to users who don't have
  patrol permissions.
* (bug 29471) Exception no longer thrown for files with invalid date in metadata.
* (bug 29492) Long-running steps in the installer (such as Upgrade and Install)
  no longer cause timeouts.
* (bug 29507) Change 'image link' to 'file link' in Special:Whatlinkshere.
* If the db is really screwed up, and doesn't have a recentchanges table,
  make the updater throw an exception instead of a fatal.
* wfArrayToCGI() and wfCgiToArray() now handle nested and associative arrays
  correctly.
* (bug 29567) mw.util.addPortletLink should only wrap link in <span> for
  "vectorTabs" portlets.
* (bug 8556) Incorrect session failure warning on preview-on-open
  namespaces (categories) when combined with $wgRawHtml.
* Use content language in formatting of dates in revertpage message
  (rollback revert edit summary) and do not adjust for user timezone.
* (bug 29277) MediaWiki:Filepage.css is also shown on the local wiki
* Make sure Backlink cache does not retrieve interwiki redirects when looking for
  redirects to a local page.
* (bug 6100) Allow different directionality (LTR/RTL) for user interface
  and wiki content, along with many other RTL and directionality improvements
  (such as bugs 28030, 12406, 28349).
* (bug 29712) Removed broken defaultUserOptionOverrides in MessagesXx files and
  unneeded CSS flipping of quickbar. Instead, introduce option 5 which sets
  left/right according to the directionality of your interface language.
* (bug 19514) Unordered list list-style-image should be IE6-compatible (8-bit).
* (bug 27410) The tag filter on a history page is now within a <label> element.
* (bug 29779) DairikiDiff/WikiDiff <ins> and <del> should undo browser default
  styling (strike/underline).
* (bug 28630) Add iwlinks, langlinks, redirect to
  RefreshLinks::deleteLinksFromNonexistent.
* (bug 29797) Error: "Tried to load block with invalid type" when subpages
  are disabled for user pages.
* (bug 12205) Bidirectional names in action=credits are split and displayed
  incorrectly when wrapped to the next line.
* (bug 20781) Move 'mainpagetext' messages to installer's .i18n file.
* (bug 29737) "MediaWiki:Qbsettings-directionality" should refer to script,
  not language.
* (bug 26360) $wgSessionHandler was overriding system settings unconditionally.
* Removed AjaxFunctions.php. The last remaining function js_unescape() was moved
  to the FCKEditor extension.
* (bug 28762) Resizing to specified height broken for very thin images.
* (bug 29959) Installer fatal when cURL and allow_url_fopen is disabled and user
  tries to subscribe to mediawiki-announce.
* (bug 27427) mw.util.getParamValue shouldn't return value from hash even if
  param is only present in hash.
* Installer checked for magic_quotes_runtime instead of register_globals.
* (bug 30131) XCache with variable caching disabled no longer used for variable
  caching (CACHE_ACCEL)
* $wgSVGMaxSize is now applied to the smaller of width or height, making very wide
  pano/timeline/diagram SVGs renderable at saner sizes.
* (bug 30219) The page shown when LocalSettings.php does not exist was broken on
  Windows servers.
* (bug 30074) Moving user JS subpages resulted in JS errors because
  #REDIRECT [[Foo]] is invalid JS.
* (bug 30335) Fix for HTMLForms using GET breaking when non-friendly URLs
  are used.
* (bug 30264) Changed installer-generated LocalSettings.php to use require_once()
  instead of require() for included extensions.
* Tracking categories are no longer shown in footer for special pages.
* (bug 30684) Fix bad escaping in mw.message for inexistent messages (i.e. <key>).
* $wgOverrideSiteFeed no longer double escapes urls.
* The preprocessor no longer fails with a PHP warning about XML_PARSE_HUGE when
  processing complex pages using newer versions of libxml2.
* (bug 30907) Special:Unusedcategories should sort ascendingly.
* (bug 28545) When using the uca-default collation, sortkey's starting with a
  space (U+20) will sort under an invisible header like in 1.16 rather than a U+6DE.
* (bug 30192) Thumbnails of archived files are now deleted.
* (bug 30843) mediawiki.Title should not convert extensions (anything after the
  last full stop) to lower case).
* (bug 31213) Exception thrown when trying to move file cross-namespace.
* (bug 18424) Special:Prefixindex and Special:Allpages paging links are
  really small, and somewhat inconsistent with each other.
* (bug 30466) Entries in iwlinks table are now cleared when moving a page over
  redirect.
* (bug 31674) Can't edit watchlist if it contains special pages.
* (bug 32100) Installer complains about Suhosin GET limit even if it is
  already set above 1024 bytes.

=== API changes in 1.18 ===
* BREAKING CHANGE: action=watch now requires POST and token.
* (bug 26339) Throw warning when truncating an overlarge API result.
* (bug 14869) Add API module for accessing QueryPage-based special pages.
* (bug 14020) API for Special:Unwatchedpages.
* (bug 24287) Wrap API Help output at 100 characters.
* Add a realname uiprop option to query=userinfo so a user's realname can be
  extracted.
* Add a &watchuser option to ApiBlock.
* (bug 26541) Generator-ise ApiQueryRecentChanges.
* action=parse now correctly returns an error for nonexistent pages.
* (bug 25767) Add userrights properties to allusers and users query lists.
* (bug 26558) list=allusers auprop=groups does not list groups a user is
  automatically a member of.
* (bug 26559) list=allusers auprop=rights does not match
  list=users usprop=rights.
* (bug 26560) On allusers if limit < total number of users, last user gets
  duplicate.
* (bug 25135) add "normalized" to action=parse.
* (bug 26460) Add support for listing category members by category pageid.
* (bug 26482) add a imimages param to prop=images.
* (bug 26498) allow LinksUpdate with API.
* (bug 26485) add a elextlinks param to prop=extlinks.
* (bug 26483) add a iwtitles param to prop=iwlinks.
* (bug 26484) add a lltitles param to prop=langlinks.
* (bug 26480) add a pppageprops param to prop=pageprops.
* (bug 26650) Remove $wgAPICacheHelp in favour of $wgAPICacheHelpTimeout.
* (bug 24650) Fix API to work with categorylinks changes.
* Expose list of skins in meta=siteinfo.
* (bug 26548) Add iiurlparam param to query=imageinfo and query=stashimageinfo.
* (bug 27205) aiprop=metadata and aiprop=parsedcomment need help text.
* Add a amtitle param to meta=allmessages.
* (bug 25832) query=allimages now outputs ns/title as well.
* (bug 27199) Thumbnail urls can be fetched for old files as well.
* (bug 27376) when using ApiBase::PARAM_TYPE => 'integer' without a min or
  max value, API doesn't validate the input is actually an integer.
* (bug 27479) API error when using both prop=pageprops and
  prop=info&inprop=displaytitle.
* (bug 27554) Update API information text to reflect change in bug 26125.
* (bug 27611) list=blocks: Use ipb_by_text instead of join with user table.
* (bug 27616) Add userid of blocked user and blocker to list=blocks.
* (bug 27688) Simplify queries to list user block information.
* (bug 27708) list=users does not have a property to return user id.
* (bug 27715) imageinfo didn't respect revdelete.
* (bug 27862) Useremail module didn't properly return success on success.
* (bug 27590) prop=imageinfo now allows querying the media type.
* (bug 27587) list=filearchive now outputs full title info.
* (bug 27018) Added action=filerevert to revert files to an old version.
* (bug 27897) list=allusers and list=users list hidden users.
* (bug 27717) API's exturlusage module does not respect $wgMiserMode.
* (bug 27588) list=filearchive&faprop=sha1 returns empty attribute.
* (bug 28010) Passing a non existent user to list=users gives internal error.
* (bug 27549) action=query&list=users&usprop=groups doesn't show implicit
  groups if a user doesn't have explicit groups.
* (bug 27670) Ordering by timestamp (and usage of start and end) isn't as clear
  in auto generated document, as it is on mediawiki.org.
* (bug 27182) API: Add filter by prefix for meta=allmessages.
* (bug 27183) API: Add filter by customisation state for meta=allmessages.
* (bug 27340) API: Allow listing of "small" categories.
* (bug 27342) Add audir param to list=allusers.
* (bug 27203) add fato param to list=filearchive.
* (bug 27341) Add drto param to list=deletedrevs.
* (bug 26630) Add API for Special:ActiveUsers.
* (bug 27020) API: Allow title prefix search of logevents (only when not in
  miser mode).
* (bug 26629) add Special:MIMESearch to API.
* (bug 27585) add pagecount to list=filearchive.
* (bug 28104) Namespace for local pages in interwiki backlinks (iwbacklinks)
  is missing.
* (bug 27343) Add parseddescription to list=filearchive.
* (bug 27469) label implicit groups in list=allusers&auprop=groups/
  list=users&usprop=groups.
* Addition of APIQuerySiteInfoGeneralInfo hook to add extra information to
  the general site info results.
* (bug 16288) API: consider making closure status of wikis more clear
  with meta=siteinfo.
* (bug 27589) list=allimages&aiprop=archivename is useless.
* (bug 27586) Remove duplication of props in ApiQueryStashImageInfo
  by using ApiQueryImageInfo.
* (bug 28226) prop=extlinks&eloffset should be an integer.
* (bug 28070) Fix watchlist RSS for databases that store timestamps in a
  real timestamp field.
* API upload errors may now return the parameter that needs to be changed and
  a sessionkey to fix the error.
* (bug 28249) allow dupes in meta=allmessages&amargs.
* (bug 28263) cannot import xml with the API, when have not "import" user
  right, but "importupload".
* (bug 28365) Added description for uiprop=preferencestoken in meta=userinfo.
* (bug 28394) Set forgotten parameters types in ApiUnblock.
* (bug 28395) Set forgotten parameters types in ApiParse.
* (bug 28368) add hint for multipart/form-data to API information of
  action=import&xml=.
* (bug 28391) action=feedwatchlist&allrev should be a bool.
* (bug 28364) add registration date to meta=userinfo.
* (bug 28254) action=paraminfo: Extract type from PARAM_DFLT if
  PARAM_TYPE is not set.
* (bug 27712) add parent_id to list=deletedrevs.
* (bug 28455) Add 'toponly' to recentchanges API module.
* (bug 26873) API: Add 'toponly' filter in usercontribs module.
* (bug 28586) YAML: strings that are the same as boolean literals.
* (bug 28591) Update/replace/supplement spyc (YAML parsing library).
* YAML API output is now 1.2 compliant, using JSON as the formatter.
* (bug 28672) give information about misermode on API.
* (bug 28558) Add iw_api and iw_wikiid to meta=siteinfo&siprop=interwikimap
* (bug 26882) Allow listing of indefinite protections with the API.
* (bug 27344) add drprefix param to list=deletedrevs.
* (bug 28560) list=deletedrevs should die, if combination of param is invalid.
* (bug 28238) paraminfo: output both limits for multi param.
* (bug 27179) API: List of extension tags through meta=siteinfo.
* Get a list of function hooks through meta=siteinfo.
* Get a list of all subscribed hooks, and those subscribers.
* (bug 28225) Allow hiding of user groups in list=allusers.
* (bug 27185) API: Add Special:ComparePages.
* (bug 28265) allow outputting of comments for action=expandtemplates.
* (bug 27790) Add query type for querymodules to output of ApiParamInfo.
* (bug 28963) Add langbacklinks query module to the api.
* (bug 27593) API should return error message when sha1/sha1base36 is invalid.
* (bug 28578) API's parse module should not silently override invalid
  title inputs.
* (bug 20699) Watchlist API should list log-events.
* (bug 29070) Require a token in API action=watch.
* (bug 29221) Expose oldrevid in ApiQueryWatchlist output.
* (bug 29267) Always give the servername for meta=siteinfo&siprop=dbrepllag.
* (bug 28897) rvparse now respects rvsection for action=query&prop=revisions.
* (bug 25734) API: Possible issue with revids validation.
* (bug 28002) Internal error in ApiFormatRaw::getMimeType.
* (bug 29237) ApiQuery now has an option to output the "iwurl" attribute.
* (bug 28392) Mark action=undelete&timestamps as type "timestamp".
* (bug 21346) Make deleted images searchable by hash (disabled in Miser Mode).
* (bug 27595) sha1 search of list=filearchive does not work.
* (bug 26763) Make RSS/Atom of user contributions more visible.
* (bug 25133) Allow redirects also for action=parse&pageid.
* (bug 29745) Fatal error in API search.
* (bug 29476) API returns page title instead of sectiontitle for
  srprop=sectiontitle.
* Correct the documentation of srprop properties.
* (bug 28817) Add reference help page link to API Modules.
* (bug 29935) Improve formatting of examples in ApiParamInfo.
* (bug 29938) list=users&usprop=rights shows rights the user doesn't have.
* (bug 24781) The API will include an XML namespace if the includexmlnamespace
  parameter is set.
* (bug 29392) Setting the start or end parameter now works with lists blocks,
  categorymembers, deletedrevs, logevents, protectedtitles, usercontributions
  and watchlist in Postgres.

=== Languages updated in 1.18 ===

MediaWiki supports over 330 languages. Many localisations are updated
regularly. Below only new and removed languages are listed, as well as
changes to languages because of Bugzilla reports.

* Angika (anp) (new).
* Brahui (brh) (new).
* Central Dusun (dtp) (new).
* Jamaican Creole English (jam) (new).
* Khowar (khw) (new).
* Liv (liv) (new).
* Kichwa (qug) (new).
* Tokipona (tp) (removed) 'tokipona' is still  valid.
* (bug 17160) Gender specific display text for User namespace.
* Link trail added for sl and sh.
* (bug 27633) Add characters to linkTrail for Portuguese (pt and pt-br).
* (bug 27426) Set $namespaceGenderAliases for Arabic (ar).
* (bug 27385) Set Polish $namespaceGenderAliases.
* (bug 27681) Set $namespaceGenderAliases for Portuguese (pt and pt-br).
* (bug 27785) Fallback language for Kabardian (kbd) is English now.
* (bug 27825) Raw watchlist edit message now uses formatted numbers.
* (bug 28040) Turkish: properly lower case 'I' to 'i' (dotless i) and
  uppercase 'i' to 'I' (dotted i).
* Conversion script between Syllabics and Latin for the Inuktitut language.
* Date formats for Indonesian (id) updated.
* Bhojpuri (bho) (renamed from "bh").
* (bug 29031) When translating block log entries, indefinite, infinite, and
  infinity are now considered the same.
* Aromanian (rup) (renamed from "rua-rup").
* Kashmiri (ks) split into Kashmiri (Perso-Arabic) (ks-arab) and Kashmiri
  (Devanagari) (ks-deva). Defaults to ks-arab.
* (bug 30864) Use bengali numerals for <ol> for Assamese.
* (bug 30817) Restored linktrail for kk (Kazakh).
* (bug 27398) Add $wgExtraGenderNamespaces for configured gendered namespaces.
* (bug 30846) New LanguageOs class.

=== Other changes in 1.18 ===
* Removed legacy wgAjaxWatch javascript global object, no longer in use.
* (bug 28556) Upload support for MacBinary files has been removed (Used by
  Internet Explorer 5 for Mac OS 9).
* On wiki farm setups using $wgConf, 'wgCanonicalServer' is now expected to be
  set for all wikis. This was already the case for 'wgServer'.

== MediaWiki 1.17 ==

== MediaWiki 1.17.5 ==
2012-06-12

This is a security release of the MediaWiki 1.17 branch.

=== Summary of selected changes in 1.17 ===

Selected changes since MediaWiki 1.16 that may be of interest:

* A new installer has been introduced. It has a wizard-style interface which is
  translated into many languages. Many shortcomings in the old installer were
  addressed with this rewrite. Note that it is no longer required for the config
  directory to be made writable by the webserver. Instead the generated
  LocalSettings.php file is offered as a download, which you must then upload
  to the wiki's base directory.

* ResourceLoader, a new framework for delivering client-side resources such as
  JavaScript and CSS, has been introduced. These resources are now delivered
  through the new entry point script "load.php", instead of as static files
  served directly by the web server. This allows minification, compression and
  client-side caching to be used more effectively, which should provide a net
  performance improvement for most users.

* Category sorting has been improved.
** Sorting is now case insensitive.
** Sub-categories, pages and files can now be paged separately.
** When several pages are given the same sort key, they sort by their
   names instead of randomly.

* The lowest supported version of PHP is now 5.2.3. If necessary, please
  upgrade PHP prior to upgrading MediaWiki.

=== Changes since 1.17.4 ===

* (bug 36938) Correctly escape uselang attribute to prevent xss
* Expanded Blacklist for SVG Files

=== Changes since 1.17.3 ===

* (bug 35961) Hash comparison should always be strict.
* Fix broken email confirmation expiration caused by MWCryptRand changes.
* (bug 35671) PHP Notice: Undefined index: gettoken in includes/api/ApiMain.php
  on line 598.

=== Changes since 1.17.2 ===

* (bug 22555) Remove or skip strip markers from tag hooks like &lt;nowiki&gt; in
  core parser functions which operate on strings, such as padleft.
* (bug 34212) ApiBlock/ApiUnblock allow action to take place without a token
  parameter present.
* (bug 34907) Fixed exposure of tokens through load.php that could have facilitated
  CSRF attacks.
* (bug 35317) CSRF in Special:Upload.

=== Changes since 1.17.1 ===
* (bug 33117) prop=revisions allows deleted text to be exposed through cache pollution.
* (bug 32709) Private Wiki users were always taken to Special:Badtitle on login.

=== Changes since 1.17.0 ===

* (bug 29535) Added missing Creative Commons CC0 icon.
* (bug 29726) Fixed failure to load internationalization messages in
  client-side scripts on WebKit-based browsers.
* Fixed a bug in message transformation where the previous language could leak
  into later transformations in the UI language.
* (bug 29091) Fixed form of native name for Ossetic language (Иронау -> Ирон)
* Fixed maintenance scripts upgrade1_5.php and rebuildImages.php, they did not
  work at all since 1.17 beta 1.
* (bug 29531) Fixed img_auth.php for thumbnails and other filenames with
  multiple dots, was broken by the fix for bug 28840.
* In the maintenance script purgeList.php, fixed a fatal error when a page
  title is given, instead of a URL.
* (bug 19514) Unordered list list-style-image should be IE6-compatible (8-bit).
* Installer checked for magic_quotes_runtime instead of register_globals.
* $wgSVGMaxSize is now applied to the smaller of width or height, making very
  wide pano/timeline/diagram SVGs renderable at saner sizes.
* (bug 29959) Installer fatal when cURL and allow_url_fopen is disabled and user
  tries to subscribe to mediawiki-announce.
* Installer checked for magic_quotes_runtime instead of register_globals
* (bug 30131) XCache with variable caching disabled no longer used for variable
  caching (CACHE_ACCEL)
* (bug 30264) Changed installer-generated LocalSettings.php to use require_once()
  instead require() for included extensions.
* (bug 26486) ResourceLoader modules with paths to nonexistent files cause PHP
  warnings/notices to be thrown
* (bug 30907) Special:Unusedcategories should sort ascendingly.
* (bug 30219) The page shown when LocalSettings.php does not exist was broken on
  Windows servers.
* Hardcoded NLS_NUMERIC_CHARACTERS for Oracle DB to prevent type conversion errors.
* Fixed recentchanges FK violation on page delete and cache purge error in updater
  for Oracle DB.
* (bug 32276) Skins were generating output using the internal page title which
  would allow anonymous users to determine whether a page exists, potentially
  leaking private data. In fact, the curid and oldid request parameters would
  allow page titles to be enumerated even when they are not guessable.
* (bug 32616) action=ajax requests were dispatched to the relevant internal
  functions without any read permission checks being done. This could lead to
  data leakage on private wikis.

=== Changes since 1.17.0rc1 ===

* Fixed syntax error in generated LocalSettings.php when a non-default user
  rights profile is chosen.
* (bug 29399) Fixed PostgreSQL installation when the DB user for installation
  is the same as the one for web access.
* (bug 29233) Fixed failover for DB slave servers. When a DB slave went down,
  an error was immediately shown to the user, instead of trying another slave.
  Was broken since 1.17 beta 1.
* (bug 29278) Fixed PHP fatal error when attempting to add text to a page via a
  redirect.
* (bug 29408) Fixed uploads of files with MIME types that aren't detected by
  MediaWiki.
* Removed DEFAULT '' NOT NULL field definitions from Oracle DB schema because
  using the DEFAULT value ('') in DML broke Oracle backend as it treats an
  empty VARCHAR2 value as NULL. Indexes on Oracle do not require NOT NULL
  fields.

=== Changes since 1.17 beta 1 ===

* Fixed warning about missing file "password.js".
* When installing on MySQL, don't attempt to create a new database user if the
  same user is used for installation and web access.
* Fixed SQL query errors in queries with table aliases.
* (bug 27891) Fixed the "chronology protector", broken since 1.17beta1, which
  ensures that when database replication is used, the new version is seen by
  the user immediately after they create or edit an article.
* (bug 28845) Allow PostgreSQL installation using a non-root user account which
  has role creation abilities.
* When installing on PostgreSQL and the install account is the same as the web
  account, check to make sure that the account has suitable privileges in the
  mediawiki schema.
* (bug 28172) Fixed error in PostgreSQL installation when creating the wiki
  sysop account.
* Fixed an issue with the Oracle installer in cases where the user is different
  to the database name.
* Added "unblockself" to the list of available rights.
* In the installer, fixed the "user rights profile" option, it never worked.
* (bug 29117) Fixed Hebrew localisation of the installer.
* (bug 28840) Reduce the collateral damage caused by the fix for bug 28235 (XSS
  on Internet Explorer 6 due to a file extension in the query string) by
  reducing the number of URLs that are blocked, and by redirecting the request
  to a safer URL where possible instead of blocking it.
* (bug 28812) Fixed documentation of API action=parse.
* (bug 28979) Fixed styling of <abbr> and <acronym>.
* Fixed the error message displayed when you try to create an account by email,
  but an email address is not given.
* Fixed JS error due to missing dependency for jquery.suggestions.
* Exposed $wgExtensionAssetsPath in JavaScript.
* (bug 28738) Made ResourceLoader support environments with small URL length
  limits. The length limit can be configured via $wgResourceLoaderMaxQueryLength,
  and this is set automatically in the generated LocalSettings.php when the
  php.ini variable "suhosin.get.max_value_length" is set. When a URL exceeds
  this limit, the request is split up. Also, reduced the average length of
  load.php URLs by using a more compact parameter format.
* (bug 25262) Fix for minification of hardcoded data: URIs in CSS.
* (bug 25124) Respect $wgStyleDirectory in ResourceLoader.
* Allow installation when no HTTP client is available, don't throw an exception.
* (bug 27465) Fix metadata extraction for SVG files using unusual namespace
  names.
* (bug 29174) Fix regression in upload-by-URL: uploading files larger than the
  PHP memory limit should work again.
* Fixed the display of comments in the new user log.
* (bug 28237) When installing extensions using the web-based installer, create
  any necessary database tables.
* (bug 28983) Fixed automated installation of extensions that overwrite $path.
* Fixed error caused by missing magic words.
* Fixed breakage of article editing in PostgreSQL due to text search
  configuration errors.
* Fixed the HTTPS client used when Curl is not available. This avoids an error
  during install about failure of the mediawiki-announce subscription.
* (bug 28162) When installing to PostgreSQL, respect the "database port" input,
  it was ignored.

=== Configuration changes in 1.17 ===

* $wgLogAutocreatedAccounts controls whether autocreation of accounts is logged
  to new users log.
* (bug 22858) $wgLocalStylePath is by default set to the same value as
  $wgStylePath but should never point to a different domain than the site is
  on, allowing skins to use .htc files which are not cross-domain friendly.
* $wgFileStore has been deprecated. The only usage $wgFileStore['deleted'] has
  been turned into $wgDeletedDirectory.
* $wgDeletedDirectory has been added to specify what directory to place deleted
  uploads in.
* IBM DB2 database no longer uses the db specific $wgDBport_db2 variable but the
  normal $wgDBport.
* $wgCategoryPrefixedDefaultSortkey was removed and is now always false.  This
  provides more sensible sorting behavior for categories.
* Removed unused globals: $wgEnableSerializedMessages, $wgCheckSerialized,
  $wgUseMemCached, $wgDisableSearchContext, $wgColorErrors, $wgUseZhdaemon,
  $wgZhdaemonHost and $wgZhdaemonPort.
* (bug 24408) The include_path is not modified in the default LocalSettings.php
* $wgVectorExtraStyles was removed, and is no longer in use.
* Removed $wgUpdates for database updates; extensions should use
  DatabaseUpdater::addExtensionUpdate() via the LoadExtensionSchemaUpdates hook.
* Removed $wgServerName. It doesn't need to be set anymore and is no longer
  available as input for other configuration items, either.
* It's no longer necessary for LocalSettings.php to include DefaultSettings.php.
* It's no longer necessary to set $wgCacheEpoch to the file modification time
  of LocalSettings.php, in LocalSettings.php itself. Instead, this is done
  automatically if $wgInvalidateCacheOnLocalSettingsChange is true (which is
  the default).
* $wgCopyrightIcon is deprecated and $wgFooterIcons['copyright']['copyright']
  should be used instead.
* $wgSysopUserBans is deprecated, and will be made permanently true in 1.18.
  If you need this functionality, you should use the BlockIp hook to filter and
  reject such blocks.
* $wgSysopRangeBans is deprecated, you should set $wgBlockCIDRLimit to maximum
  (32 for IPv4, 128 for IPv6), equivalent to allowing rangeblocks of only 1
  address at a time.

=== New features in 1.17 ===

* (bug 10183) Users can now add personal styles and scripts to all skins via
  User:<name>/common.css and /common.js (if user css/js is enabled).
* (bug 22748) Add anchors on Special:ListGroupRights.
* (bug 21981) Add parameter 'showfilename' to <gallery> to automatically
  apply the names of the individual files within the gallery.
* Future-proof redirection to fragments in Gecko, so things work a little nicer
  if they fix <https://bugzilla.mozilla.org/show_bug.cgi?id=516293>.
* Support git:// and mms:// protocols by default for external links.
* (bug 15810) Blocked admins can no longer unblock themselves without the
  'unblockself' permission (which they have by default).
* (bug 18499) Added "enhanced" URL parameter to switch between old and enhanced
  changes list.
* (bug 22925) "sp-contributions-blocked-notice-anon" message now displayed when
  viewing contributions of a blocked IP address.
* (bug 22474) {{urlencode:}} now takes an optional second parameter for type of
  escaping.
* Special:Listfiles now supports a username parameter.
* Special:Random carries over query string parameters.
* (bug 23206) Add Special::Search hook for detecting successful "Go".
* When visiting a "red link" of a deleted file, a deletion and move log excerpt
  is provided on the Upload form.
* (bug 22647) Add category details in search results.
* (bug 23276) Add hook to Special:NewPages to modify query.
* Add accesskey 's' and tooltip to 'Save' button at Special:Preferences.
* Add accesskey 'b' and tooltip to the summary field of edit mode.
* (bug 20186) Allow filtering Special:Contributions for RevisionDeleted edits.
* ajaxwatch now uses the API and JQuery, and can be used to animate arbitrary
  watch links, not just to watch the page the link is on.
* (bug 20976) "searchmenu-new-nocreate" message now displayed when there
  is no title match in search and the user has no rights to create pages.
* (bug 23429) Added new hook WatchlistEditorBuildRemoveLine.
* (bug 22844) Added support for WinCache object caching (for IIS).
* (bug 23580) Add two new events to LivePreview so that scripts can be notified
  about the beginning and finishing of LivePreview actions.
* (bug 21278) Now the sidebar allows inclusion of wiki markup.
* (bug 23733) Add IDs to messages used on CSS/JS pages.
* Show validity period of the login cookie in Special:UserLogin and
  Special:Preferences.
* Interlanguage links display the page title in their tooltip.
* (bug 23621) New Special:ComparePages to compare (diff) two articles.
* (bug 4597) Provide support in Special:Contributions to show only "current"
  contributions
* (bug 17857) {{anchorencode}} acts more like how the parser creates section ids
* (bug 21477) \& can now be used in <math>
* (bug 11641) \dotsc \dotsm \dotsi \dotso can now be used in <math>
* (bug 21475) \mathtt and \textsf can now be used in <math>
* texvc is now run via ulimit4.sh, to limit execution time.
* SQLite now supports $wgSharedDB.
* (bug 8507) Group file links by namespace:title on image pages.
* Stop emitting named entities, so we can use <!DOCTYPE html> while still being
  well-formed XML.
* texvc now supports \bcancel and \xcancel in addition to \cancel and \cancelto
* Added scriptExtension setting to $wgForeignFileRepos.
* ForeignApiRepo uses scriptDirUrl if apiBase not set.
* (bug 24212) Added MediaWiki:Filepage.css which is also included on foreign
  client wikis.
* (bug 14685) Double underscore magic word usage is now tracked in the
  page_props table, as well as the behavioral magic words {{DEFAULTSORT}} and
  {{DISPLAYTITLE}}
* (bug 24045) MediaWiki:Ipb-needreblock is now wrapped in a div with class
  "mw-ipb-needreblock"
* Non-file