$EnablePreviewChanges to show "No changes" if there are no changes.

git-svn-id: svn://pmwiki.org/pmwiki/trunk@4679 524c5546-5005-0410-9a3e-e25e191bd360

1 files changed, 7 insertions, 2 deletions

diff --git a/scripts/pagerev.php b/scripts/pagerev.php
index b2e00909..767628b1 100644
--- a/scripts/pagerev.php
+++ b/scripts/pagerev.php
@@ -298,17 +298,22 @@ if (IsEnabled($EnableDiffInline, 1) && $DiffShow['source'] == 'y'
 ## Show diff before the preview Cookbook:PreviewChanges
 function PreviewDiff($pagename,&$page,&$new) {
   global $FmtV, $DiffFunction, $DiffHTMLFunction, $EnableDiffInline, $DiffShow;
-  if (@$_REQUEST['preview']>'' && @$page['text']>'' && $page['text']!=$new['text']) {
+  if (!@$_REQUEST['preview'] || !isset($page['text'])) return;
+  if ($page['text'] == $new['text']) {
+    $diff = '<div class="diffadd">' . XL('No changes') . '</div>';
+  }
+  else {
     $d = IsEnabled($DiffShow['source'], 'y');
     $e = IsEnabled($EnableDiffInline, 1);
     $DiffShow['source'] = 'y';
     $EnableDiffInline = 1;
     SDV($DiffHTMLFunction, 'DiffHTML');
     $diff = $DiffFunction($new['text'], $page['text']);# reverse the diff
-    $FmtV['$PreviewText'] = $DiffHTMLFunction($pagename, $diff).'<hr/>'.@$FmtV['$PreviewText'];
+    $diff = $DiffHTMLFunction($pagename, $diff);
     $DiffShow['source'] = $d;
     $EnableDiffInline = $e;
   }
+  $FmtV['$PreviewText'] = $diff .'<hr/>' . @$FmtV['$PreviewText'];
 }
 if (IsEnabled($EnablePreviewChanges, 0) && @$_REQUEST['preview']>'') {
   $EditFunctions[] = 'PreviewDiff';