Ticket #21203: 21203.2.patch

wp-includes/post-template.php

@@ -319 +319 @@
                 return $classes;
 
         $classes[] = 'post-' . $post->ID;
-        $classes[] = $post->post_type;
+        if ( ! is_admin() )
+                $classes[] = $post->post_type;
         $classes[] = 'type-' . $post->post_type;
         $classes[] = 'status-' . $post->post_status;