Improved BagOStuff docs.

[lhc/web/wiklou.git] / includes / diff / DifferenceEngine.php

diff --git a/includes/diff/DifferenceEngine.php b/includes/diff/DifferenceEngine.php
index 9afe69e..97553e6 100644 (file)
--- a/includes/diff/DifferenceEngine.php
+++ b/includes/diff/DifferenceEngine.php
@@ -38,6 +38,9 @@ class DifferenceEngine extends ContextSource {
         * @private
         */
        var $mOldid, $mNewid;
+       /**
+        * @var Content
+        */
        var $mOldContent, $mNewContent;
        protected $mDiffLang;
 
@@ -291,8 +294,11 @@ class DifferenceEngine extends ContextSource {
 
                        if ( $samePage && $this->mNewPage->quickUserCan( 'edit', $user ) ) {
                                if ( $this->mNewRev->isCurrent() && $this->mNewPage->userCan( 'rollback', $user ) ) {
-                                       $out->preventClickjacking();
-                                       $rollback = '   ' . Linker::generateRollback( $this->mNewRev, $this->getContext() );
+                                       $rollbackLink = Linker::generateRollback( $this->mNewRev, $this->getContext() );
+                                       if ( $rollbackLink ) {
+                                               $out->preventClickjacking();
+                                               $rollback = '   ' . $rollbackLink;
+                                       }
                                }
                                if ( !$this->mOldRev->isDeleted( Revision::DELETED_TEXT ) && !$this->mNewRev->isDeleted( Revision::DELETED_TEXT ) ) {
                                        $undoLink = ' ' . $this->msg( 'parentheses' )->rawParams(
@@ -610,8 +616,8 @@ class DifferenceEngine extends ContextSource {
        /**
         * Get complete diff table, including header
         *
-        * @param $otitle Title: old title
-        * @param $ntitle Title: new title
+        * @param string|bool $otitle Header for old text or false
+        * @param string|bool $ntitle Header for new text or false
         * @param $notice String: HTML between diff header and body
         * @return mixed
         */