Make Parser::$mOutput private

This property was deprecated in 1.35.  The replacement function
Parser::getOutput() was introduced in MediaWiki 1.12.2
(commit 350b498b9f).

Code search:
https://codesearch.wmcloud.org/search/?q=ser-%3EmOutput&i=nope&files=&excludeFiles=&repos=

Depends-On clauses below are for WMF-deployed code.  Other uses in
non-WMF-deployed code have been patched in:
* I550b19f58520f30ce158dab1969108edc9cdcce9 (SemanticDrilldown)
* https://github.com/SemanticMediaWiki/SemanticFormsSelect/pull/81
* Ic2798b0df5f1f11aea6becdfc186f1be0ecb43e4 (ApprovedRevs)
* I58dff3fc17292d9f6b5e1e43b3d18485027ec880 (DisplayTitle)
* Idd9736dacf257788d74e503687b8554e138ec3c5 (JsonData)
* Ia42f9fa0c45abe6eef21c9815f3f6d6794e3cf95 (MediaFunctions)
* I4f4f7b0118470741a6cdaba562f858e425fcf350 (ParserFunctions)
* Ie44573d9952e62e1fe75e2b9f4691e0d757c53c1 (PhpTags)
* Ib59a4789cfeebf1acbc24c5c00fb996413ae9d5c (SmoothGallery)
* I2b6f3be928a4cb101836ded7abaf2eb8665d4d50 (TinyMCE)
* https://gitlab.com/hydrawiki/extensions/DynamicPageList/-/merge_requests/118
* https://gitlab.com/nonsensopedia/extensions/advancedbacklinks/-/merge_requests/91
* https://github.com/SemanticMediaWiki/SemanticMediaWiki/pull/4935

Bug: T275160
Depends-On: I4f4f7b0118470741a6cdaba562f858e425fcf350
Change-Id: Ib5e9e22db1781ba338dc63ec479ef587de2cd675

RELEASE-NOTES-1.36

@@ -291,6 +291,7 @@ because of Phabricator reports.
   private:
   - $mTagHooks - use Parser::getTags()
   - $mFunctionHooks - use Parser::getFunctionHooks()
+  - $mOutput - use Parser::getOutput()
 * The ParserBeforeTidy hook, deprecated in 1.35, has been removed.
 * The ParserBeforeTidy, ParserBeforeStrip, and ParserAfterStrip hooks,
   deprecated in 1.35, have been removed.

includes/parser/CoreParserFunctions.php

@@ -482,9 +482,9 @@ class CoreParserFunctions {
 			&& !$title->hasFragment()
 			&& $title->equals( $parser->getTitle() ) )
 		) {
-			$old = $parser->mOutput->getProperty( 'displaytitle' );
+			$old = $parser->getOutput()->getProperty( 'displaytitle' );
 			if ( $old === false || $arg !== 'displaytitle_noreplace' ) {
-				$parser->mOutput->setDisplayTitle( $text );
+				$parser->getOutput()->setDisplayTitle( $text );
 			}
 			if ( $old !== false && $old !== $text && !$arg ) {
 

includes/parser/Parser.php

@@ -185,9 +185,8 @@ class Parser {
 	# Cleared with clearState():
 	/**
 	 * @var ParserOutput
-	 * @deprecated since 1.35; use Parser::getOutput()
 	 */
-	public $mOutput;
+	private $mOutput;
 	private $mAutonumber;
 
 	/**
@@ -1018,6 +1017,7 @@ class Parser {
 
 	/**
 	 * @return ParserOutput
+	 * @since 1.12.2
 	 */
 	public function getOutput() {
 		return $this->mOutput;