MovePage - use PageUpdater to create redirect page

After parent patch MovePage changed code is covered
by tests, plus tested locally quite a bit. Seems to work.

Change-Id: I0f8db203eb4aa767e5e1f3067f3a9e35835f38ea

includes/MovePage.php

@@ -31,7 +31,6 @@ use MediaWiki\Page\PageIdentity;
 use MediaWiki\Page\WikiPageFactory;
 use MediaWiki\Permissions\Authority;
 use MediaWiki\Permissions\PermissionStatus;
-use MediaWiki\Revision\MutableRevisionRecord;
 use MediaWiki\Revision\RevisionRecord;
 use MediaWiki\Revision\RevisionStore;
 use MediaWiki\Revision\SlotRecord;
@@ -1027,52 +1026,12 @@ class MovePage {
 		if ( $redirectContent ) {
 			$redirectArticle = $this->wikiPageFactory->newFromTitle( $this->oldTitle );
 			$redirectArticle->loadFromRow( false, WikiPage::READ_LOCKING ); // T48397
-			$newid = $redirectArticle->insertOn( $dbw );
-			if ( $newid ) { // sanity
-				$this->oldTitle->resetArticleID( $newid );
-				$redirectRevRecord = new MutableRevisionRecord( $this->oldTitle );
-				$redirectRevRecord->setPageId( $newid )
-					->setUser( $user )
-					->setComment( $commentObj )
-					->setContent( SlotRecord::MAIN, $redirectContent )
-					->setTimestamp( MWTimestamp::now( TS_MW ) );
-
-				$inserted = $this->revisionStore->insertRevisionOn(
-					$redirectRevRecord,
-					$dbw
-				);
-				$redirectRevId = $inserted->getId();
-				$redirectArticle->updateRevisionOn( $dbw, $inserted, 0 );
-
-				$fakeTags = [];
-				$this->hookRunner->onRevisionFromEditComplete(
-					$redirectArticle,
-					$inserted,
-					false,
-					$user,
-					$fakeTags
-				);
-
-				// Clear all caches to make sure no stale information is used
-				// when parsing the newly created redirect. Without this, moves would fail
-				// under certain conditions when Lua core runs on the new page.
-				// It is not entirely clear why this is needed, we just found that
-				// it fixes the issue at hand (T279832).
-				Title::clearCaches();
-
-				$redirectArticle->doEditUpdates(
-					$inserted,
-					$user,
-					[ 'created' => true ]
-				);
-
-				// make a copy because of log entry below
-				$redirectTags = $changeTags;
-				if ( in_array( 'mw-new-redirect', ChangeTags::getSoftwareTags() ) ) {
-					$redirectTags[] = 'mw-new-redirect';
-				}
-				ChangeTags::addTags( $redirectTags, null, $redirectRevId, null );
-			}
+			$redirectArticle->newPageUpdater( $user )
+				->setContent( SlotRecord::MAIN, $redirectContent )
+				->addTags( $changeTags )
+				->addSoftwareTag( 'mw-new-redirect' )
+				->setUsePageCreationLog( false )
+				->saveRevision( $commentObj );
 		}
 
 		# Log the move

includes/Storage/PageUpdater.php

@@ -193,6 +193,9 @@ class PageUpdater {
 	 */
 	private $flags = 0;
 
+	/** @var string[] */
+	private $softwareTags = [];
+
 	/**
 	 * @param UserIdentity $author
 	 * @param WikiPage $wikiPage
@@ -253,6 +256,7 @@ class PageUpdater {
 				]
 			)
 		);
+		$this->softwareTags = $softwareTags;
 	}
 
 	/**
@@ -612,6 +616,21 @@ class PageUpdater {
 		return $this;
 	}
 
+	/**
+	 * Sets software tag to this update. If the tag is not defined in the
+	 * current software tags, it's ignored.
+	 *
+	 * @since 1.38
+	 * @param string $tag
+	 * @return $this
+	 */
+	public function addSoftwareTag( string $tag ): self {
+		if ( in_array( $tag, $this->softwareTags ) ) {
+			$this->addTag( $tag );
+		}
+		return $this;
+	}
+
 	/**
 	 * Returns the list of tags set using the addTag() method.
 	 *