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diff --git a/vendor/oojs/oojs-ui/src/toolgroups/ListToolGroup.js b/vendor/oojs/oojs-ui/src/toolgroups/ListToolGroup.js
new file mode 100644
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+++ b/vendor/oojs/oojs-ui/src/toolgroups/ListToolGroup.js
@@ -0,0 +1,133 @@
+/**
+ * Drop down list layout of tools as labeled icon buttons.
+ *
+ * This layout allows some tools to be collapsible, controlled by a "More" / "Fewer" option at the
+ * bottom of the main list. These are not automatically positioned at the bottom of the list; you
+ * may want to use the 'promote' and 'demote' configuration options to achieve this.
+ *
+ * @class
+ * @extends OO.ui.PopupToolGroup
+ *
+ * @constructor
+ * @param {OO.ui.Toolbar} toolbar
+ * @param {Object} [config] Configuration options
+ * @cfg {Array} [allowCollapse] List of tools that can be collapsed. Remaining tools will be always
+ *  shown.
+ * @cfg {Array} [forceExpand] List of tools that *may not* be collapsed. All remaining tools will be
+ *  allowed to be collapsed.
+ * @cfg {boolean} [expanded=false] Whether the collapsible tools are expanded by default
+ */
+OO.ui.ListToolGroup = function OoUiListToolGroup( toolbar, config ) {
+	// Allow passing positional parameters inside the config object
+	if ( OO.isPlainObject( toolbar ) && config === undefined ) {
+		config = toolbar;
+		toolbar = config.toolbar;
+	}
+
+	// Configuration initialization
+	config = config || {};
+
+	// Properties (must be set before parent constructor, which calls #populate)
+	this.allowCollapse = config.allowCollapse;
+	this.forceExpand = config.forceExpand;
+	this.expanded = config.expanded !== undefined ? config.expanded : false;
+	this.collapsibleTools = [];
+
+	// Parent constructor
+	OO.ui.ListToolGroup.super.call( this, toolbar, config );
+
+	// Initialization
+	this.$element.addClass( 'oo-ui-listToolGroup' );
+};
+
+/* Setup */
+
+OO.inheritClass( OO.ui.ListToolGroup, OO.ui.PopupToolGroup );
+
+/* Static Properties */
+
+OO.ui.ListToolGroup.static.name = 'list';
+
+/* Methods */
+
+/**
+ * @inheritdoc
+ */
+OO.ui.ListToolGroup.prototype.populate = function () {
+	var i, len, allowCollapse = [];
+
+	OO.ui.ListToolGroup.super.prototype.populate.call( this );
+
+	// Update the list of collapsible tools
+	if ( this.allowCollapse !== undefined ) {
+		allowCollapse = this.allowCollapse;
+	} else if ( this.forceExpand !== undefined ) {
+		allowCollapse = OO.simpleArrayDifference( Object.keys( this.tools ), this.forceExpand );
+	}
+
+	this.collapsibleTools = [];
+	for ( i = 0, len = allowCollapse.length; i < len; i++ ) {
+		if ( this.tools[ allowCollapse[ i ] ] !== undefined ) {
+			this.collapsibleTools.push( this.tools[ allowCollapse[ i ] ] );
+		}
+	}
+
+	// Keep at the end, even when tools are added
+	this.$group.append( this.getExpandCollapseTool().$element );
+
+	this.getExpandCollapseTool().toggle( this.collapsibleTools.length !== 0 );
+	this.updateCollapsibleState();
+};
+
+OO.ui.ListToolGroup.prototype.getExpandCollapseTool = function () {
+	if ( this.expandCollapseTool === undefined ) {
+		var ExpandCollapseTool = function () {
+			ExpandCollapseTool.super.apply( this, arguments );
+		};
+
+		OO.inheritClass( ExpandCollapseTool, OO.ui.Tool );
+
+		ExpandCollapseTool.prototype.onSelect = function () {
+			this.toolGroup.expanded = !this.toolGroup.expanded;
+			this.toolGroup.updateCollapsibleState();
+			this.setActive( false );
+		};
+		ExpandCollapseTool.prototype.onUpdateState = function () {
+			// Do nothing. Tool interface requires an implementation of this function.
+		};
+
+		ExpandCollapseTool.static.name = 'more-fewer';
+
+		this.expandCollapseTool = new ExpandCollapseTool( this );
+	}
+	return this.expandCollapseTool;
+};
+
+/**
+ * @inheritdoc
+ */
+OO.ui.ListToolGroup.prototype.onMouseKeyUp = function ( e ) {
+	// Do not close the popup when the user wants to show more/fewer tools
+	if (
+		$( e.target ).closest( '.oo-ui-tool-name-more-fewer' ).length &&
+		( e.which === 1 || e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER )
+	) {
+		// HACK: Prevent the popup list from being hidden. Skip the PopupToolGroup implementation (which
+		// hides the popup list when a tool is selected) and call ToolGroup's implementation directly.
+		return OO.ui.ListToolGroup.super.super.prototype.onMouseKeyUp.call( this, e );
+	} else {
+		return OO.ui.ListToolGroup.super.prototype.onMouseKeyUp.call( this, e );
+	}
+};
+
+OO.ui.ListToolGroup.prototype.updateCollapsibleState = function () {
+	var i, len;
+
+	this.getExpandCollapseTool()
+		.setIcon( this.expanded ? 'collapse' : 'expand' )
+		.setTitle( OO.ui.msg( this.expanded ? 'ooui-toolgroup-collapse' : 'ooui-toolgroup-expand' ) );
+
+	for ( i = 0, len = this.collapsibleTools.length; i < len; i++ ) {
+		this.collapsibleTools[ i ].toggle( this.expanded );
+	}
+};