diff --git a/mod/wiki/ewiki/plugins/action/diff.php b/mod/wiki/ewiki/plugins/action/diff.php
deleted file mode 100755
index bcf3a46148c..00000000000
--- a/mod/wiki/ewiki/plugins/action/diff.php
+++ /dev/null
@@ -1,65 +0,0 @@
-<?php
-
- # this is the "stupid diff", which shows up changes between two
- # saved versions of a WikiPage; even if working very unclean it
- # allows to see what has changed
- # it is accessible through the "info about page" action
-
-
-
- $ewiki_plugins["action"]["diff"] = "ewiki_page_stupid_diff";
- $ewiki_config["action_links"]["info"]["diff"] = "diff";
-
-
-
- function ewiki_page_stupid_diff($id, $data, $action) {
-
-
-    if ($uu=$GLOBALS["ewiki_diff_versions"]) {
-       list($new_ver, $old_ver) = $uu;
-       $data = ewiki_database("GET", array("id" => $id, "version" => $new_ver));
-    }
-    else {
-       $new_ver = $data["version"];
-       $old_ver = $new_ver - 1;
-    }
-    if ($old_ver > 0) {
-       $data0 = ewiki_database("GET", array("id" => $id, "version" => $old_ver));
-    }
-
-    $o = ewiki_make_title($id, "Differences between version $new_ver and $old_ver of »{$id}«");
-
-    $txt0 = preg_split("/\s*\n/", trim($data0["content"]));
-    $txt2 = preg_split("/\s*\n/", trim($data["content"]));
-
-    $diff0 = array_diff($txt0, $txt2);
-    $diff2 = array_diff($txt2, $txt0);
-
-    foreach ($txt2 as $i => $line) {
-
-       $line = htmlentities($line);
-
-       $i2 = $i;
-       while ($rm = $diff0[$i2++]) {
-          $o .= "<b>-</b><font color=\"#990000\"> <tt>$rm</tt></font><br>\n";
-          unset($diff0[$i2-1]);
-       }
-
-       if (in_array($line, $diff2)) {
-          $o .= "<b>+</b><font color=\"#009900\"> <tt>$line</tt></font><br>\n";
-       }
-       else {
-          $o .= "&nbsp; $line<br>\n";
-       }
-
-    }
-
-    foreach ($diff0 as $rm) {
-       $o .= "<b>-</b><font color=\"#990000\"> <tt>$rm</tt></font><br>\n";
-    }
-
-    return($o);
- }
-
-
-?>
\ No newline at end of file
diff --git a/mod/wiki/ewiki/plugins/moodle/diff.php b/mod/wiki/ewiki/plugins/moodle/diff.php
new file mode 100755
index 00000000000..16747d90eb7
--- /dev/null
+++ b/mod/wiki/ewiki/plugins/moodle/diff.php
@@ -0,0 +1,96 @@
+<?php
+
+ # this is the "stupid diff", which shows up changes between two
+ # saved versions of a WikiPage; even if working very unclean it
+ # allows to see what has changed
+ # it is accessible through the "info about page" action
+
+
+
+ $ewiki_plugins["action"]["diff"] = "ewiki_page_stupid_diff";
+ $ewiki_config["action_links"]["info"]["diff"] = "diff";
+
+
+
+ function ewiki_page_stupid_diff($id, $data, $action) {
+    global $wiki;
+
+    if ($uu=$GLOBALS["ewiki_diff_versions"]) {
+       list($new_ver, $old_ver) = $uu;
+       $data = ewiki_database("GET", array("id" => $id, "version" => $new_ver));
+    }
+    else {
+       $new_ver = $data["version"];
+       $old_ver = $new_ver - 1;
+    }
+    if ($old_ver > 0) {
+       $data0 = ewiki_database("GET", array("id" => $id, "version" => $old_ver));
+    }
+    
+    $a->new_ver=$new_ver;
+    $a->old_ver=$old_ver;
+    $a->pagename=$id;
+    $o = ewiki_make_title($id, get_string("differences","wiki",$a));
+
+    # Different handling for html: closes Bug #1530 - Wiki diffs useless when using HTML editor    
+    if($wiki->htmlmode==2) {
+      $htmlendings=array("<br />","<br>","</p>","<hr />","<hr>","</li>","</tr>");
+      $splitregexp="+\s*\n|\s*(".join("|",$htmlendings).")+";
+      $content0=preg_replace("+(".join("|",$htmlendings).")+","\n",$data0["content"]);
+      $content=preg_replace("+(".join("|",$htmlendings).")+","\n",$data["content"]);
+    } else {
+      $splitregexp="/\s*\n/";      
+      $content0=$data0["content"];
+      $content=$data["content"];
+    }
+    $txt0 = preg_split($splitregexp, trim($content0));
+    $txt2 = preg_split($splitregexp, trim($content));
+
+    /// Remove empty lines in html
+    if($wiki->htmlmode==2) {
+      $html0=$txt0;
+      $html2=$txt2;
+      $txt0=array();
+      $txt2=array();
+      
+      for($i=0;$i<count($html0);$i++) {
+        if(trim(strip_tags($html0[$i]))) { // There is something !
+          $txt0[]=$html0[$i];
+        }
+      }
+      for($i=0;$i<count($html2);$i++) {
+        if(trim(strip_tags($html2[$i]))) { // There is something !
+          $txt2[]=$html2[$i];
+        }
+      }  
+    }
+        
+    $diff0 = array_diff($txt0, $txt2);
+    $diff2 = array_diff($txt2, $txt0);
+
+    foreach ($txt2 as $i => $line) {
+       if($wiki->htmlmode != 2) {
+         $line = htmlentities($line);
+       }
+       $i2 = $i;
+       while ($rm = $diff0[$i2++]) {          
+          $o .= "<b>-</b><font color=\"#990000\"><tt>$rm</tt></font><br>\n";
+          unset($diff0[$i2-1]);
+       }
+
+       if (in_array($line, $diff2)) {
+          $o .= "<b>+</b><font color=\"#009900\"> <tt>$line</tt></font><br>\n";
+       }
+       else {
+          $o .= "&nbsp; $line<br>\n";
+       }
+
+    }
+
+    foreach ($diff0 as $rm) {
+       $o .= "<b>-</b><font color=\"#990000\"> <tt>$rm</tt></font><br>\n";
+    }
+
+    return($o);
+ }
+?>
\ No newline at end of file