From 57b47a742def523c06e0404ca275825e497dc365 Mon Sep 17 00:00:00 2001
From: Aaron Schulz <aaron@users.mediawiki.org>
Date: Mon, 5 Feb 2007 23:28:17 +0000
Subject: [PATCH] * Fix exception with "undo", use revText() for proper diffs

---
 includes/DifferenceEngine.php | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/includes/DifferenceEngine.php b/includes/DifferenceEngine.php
index 234adcdac3..e6218b6d9c 100644
--- a/includes/DifferenceEngine.php
+++ b/includes/DifferenceEngine.php
@@ -336,7 +336,9 @@ CONTROL;
 		if ( !$this->loadText() ) {
 			wfProfileOut( $fname );
 			return false;
-		} else if ( !$this->mOldRev->userCan(Revision::DELETED_TEXT) || !$this->mNewRev->userCan(Revision::DELETED_TEXT) ) {
+		} else if ( $this->mOldRev && !$this->mOldRev->userCan(Revision::DELETED_TEXT) ) {
+		  return '';
+		} else if ( $this->mNewRev && !$this->mNewRev->userCan(Revision::DELETED_TEXT) ) {
 		  return '';
 		}
 
@@ -478,10 +480,10 @@ CONTROL;
 	function addHeader( $diff, $otitle, $ntitle, $multi = '' ) {
 		global $wgOut;
 	
-		if ( !$this->mOldRev->userCan(Revision::DELETED_TEXT) ) {
+		if ( $this->mOldRev && $this->mOldRev->isDeleted(Revision::DELETED_TEXT) ) {
 		   $otitle = '<span class="history-deleted">'.$otitle.'</span>';
 		}
-		if ( !$this->mNewRev->userCan(Revision::DELETED_TEXT) ) {
+		if ( $this->mNewRev && $this->mNewRev->isDeleted(Revision::DELETED_TEXT) ) {
 		   $ntitle = '<span class="history-deleted">'.$ntitle.'</span>';
 		}
 		$header = "
@@ -610,13 +612,13 @@ CONTROL;
 		}
 		if ( $this->mOldRev ) {
 			// FIXME: permission tests
-			$this->mOldtext = $this->mOldRev->getText();
+			$this->mOldtext = $this->mOldRev->revText();
 			if ( $this->mOldtext === false ) {
 				return false;
 			}
 		}
 		if ( $this->mNewRev ) {
-			$this->mNewtext = $this->mNewRev->getText();
+			$this->mNewtext = $this->mNewRev->revText();
 			if ( $this->mNewtext === false ) {
 				return false;
 			}
-- 
2.20.1