- # Inform the user of our success and set an automatic edit summary
- $undoMsg = 'success';
-
- # If we just undid one rev, use an autosummary
- $firstrev = $oldrev->getNext();
- if ( $firstrev && $firstrev->getId() == $undo ) {
- $userText = $undorev->getUserText();
- if ( $userText === '' ) {
- $undoSummary = wfMessage(
- 'undo-summary-username-hidden',
- $undo
- )->inContentLanguage()->text();
- } else {
- $undoSummary = wfMessage(
- 'undo-summary',
- $undo,
- $userText
- )->inContentLanguage()->text();
+ $oldContent = $this->mArticle->getPage()->getContent( Revision::RAW );
+ $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
+ $newContent = $content->preSaveTransform( $this->mTitle, $wgUser, $popts );
+
+ if ( $newContent->equals( $oldContent ) ) {
+ # Tell the user that the undo results in no change,
+ # i.e. the revisions were already undone.
+ $undoMsg = 'nochange';
+ $content = false;
+ } else {
+ # Inform the user of our success and set an automatic edit summary
+ $undoMsg = 'success';
+
+ # If we just undid one rev, use an autosummary
+ $firstrev = $oldrev->getNext();
+ if ( $firstrev && $firstrev->getId() == $undo ) {
+ $userText = $undorev->getUserText();
+ if ( $userText === '' ) {
+ $undoSummary = wfMessage(
+ 'undo-summary-username-hidden',
+ $undo
+ )->inContentLanguage()->text();
+ } else {
+ $undoSummary = wfMessage(
+ 'undo-summary',
+ $undo,
+ $userText
+ )->inContentLanguage()->text();
+ }
+ if ( $this->summary === '' ) {
+ $this->summary = $undoSummary;
+ } else {
+ $this->summary = $undoSummary . wfMessage( 'colon-separator' )
+ ->inContentLanguage()->text() . $this->summary;
+ }
+ $this->undidRev = $undo;