Ticket #16366: 16366.2.diff

wp-includes/user.php

@@ -489 +489 @@
                         else
                                 $search_columns = array('user_login', 'user_nicename');
 
+                        $search_columns = apply_filters('user_search_columns', $search_columns, $search);
+
                         $this->query_where .= $this->get_search_sql( $search, $search_columns, $wild );
                 }