Ticket #17026: parent-dropdown_filters_3.2.patch

wp-admin/includes/template.php

@@ -675 +675 @@
  */
 function parent_dropdown( $default = 0, $parent = 0, $level = 0 ) {
         global $wpdb, $post_ID;
-        $items = $wpdb->get_results( $wpdb->prepare("SELECT ID, post_parent, post_title FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'page' ORDER BY menu_order", $parent) );
+        $items = $wpdb->get_results( apply_filters( 'parent_dropdown_query', $wpdb->prepare("SELECT ID, post_parent, post_title FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'page' ORDER BY menu_order", $parent ), $parent, 'page' ) );
 
         if ( $items ) {
                 foreach ( $items as $item ) {