Ticket #16644: 16644.2.diff

wp-includes/taxonomy.php

@@ -2842 +2842 @@
         $t = get_taxonomy($taxonomy);
 
         if ( empty($termlink) ) {
-                if ( $t->query_var )
+                if ( 'category' == $taxonomy )
+                        $termlink = '?cat=' . $term->term_id;
+                elseif ( $t->query_var )
                         $termlink = "?$t->query_var=$slug";
                 else
                         $termlink = "?taxonomy=$taxonomy&term=$slug";