Ticket #15959: 15959.patch

wp-includes/link-template.php

@@ -1101 +1101 @@
         if ( empty( $post ) )
                 return null;
 
+        if ( $in_same_cat ) {
+                $taxonomies = get_object_taxonomies($post);
+                if ( ! in_array('category', $taxonomies) )
+                        $in_same_cat = false;
+        }
+
         $current_post_date = $post->post_date;
 
         $join = '';