1 files changed, 14 insertions, 1 deletions
diff --git a/includes/WikiPage.php b/includes/WikiPage.php
index 7c3dc937..61a05a12 100644
--- a/includes/WikiPage.php
+++ b/includes/WikiPage.php
@@ -48,9 +48,11 @@ class WikiPage implements Page, IDBAccessObject {
 	public $mDataLoaded = false;         // !< Boolean
 	public $mIsRedirect = false;         // !< Boolean
 	public $mLatest = false;             // !< Integer (false means "not loaded")
-	public $mPreparedEdit = false;       // !< Array
 	/**@}}*/
 
+	/** @var stdclass Map of cache fields (text, parser output, ect) for a proposed/new edit */
+	protected $mPreparedEdit = false;
+
 	/**
 	 * @var int
 	 */
@@ -242,6 +244,17 @@ class WikiPage implements Page, IDBAccessObject {
 		$this->mTimestamp = '';
 		$this->mIsRedirect = false;
 		$this->mLatest = false;
+		// Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
+		// the requested rev ID and immutable content against the cached one.
+		// Clearing it can cause extra parses on edit for no reason.
+	}
+
+	/**
+	 * Clear the mPreparedEdit cache field, as may be needed by mutable content types
+	 * @return void
+	 * @since 1.23
+	 */
+	public function clearPreparedEdit() {
 		$this->mPreparedEdit = false;
 	}