Ticket #34803: 34803.diff

src/wp-includes/post.php

@@ -2409 +2409 @@
                 $wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => $post->post_type ) );
         }
 
+        if ( $post->post_type == 'nav_menu_item') {
+                // Get this menu item's parent
+                $parent_menu_id = (int)get_post_meta ( $post->ID, '_menu_item_menu_item_parent', true );
+
+                // Move all children of this nav menu to the parent
+                $children_query = $wpdb->prepare("UPDATE $wpdb->postmeta SET meta_value = %d WHERE meta_key = '_menu_item_menu_item_parent' AND meta_value=%s", $parent_menu_id, $post->ID);
+                $children = $wpdb->query ( $children_query );
+        }
+
         // Do raw query. wp_get_post_revisions() is filtered.
         $revision_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'revision'", $postid ) );
         // Use wp_delete_post (via wp_delete_post_revision) again. Ensures any meta/misplaced data gets cleaned up.