Index: menu.inc
===================================================================
--- menu.inc	(revision 5)
+++ menu.inc	(working copy)
@@ -1273,6 +1273,7 @@
       $l['href'] = $item['link']['href'];
       $l['title'] = $item['link']['title'];
       if ($item['link']['in_active_trail']) {
+        $l['in_active_trail'] = $item['link']['in_active_trail'];
         $class = ' active-trail';
       }
       // Keyed with the unique mlid to generate classes in theme_links().