Ticket #29463: 29463.2.diff

src/wp-includes/default-widgets.php

@@ -1344 +1344 @@
                 if ( !empty($instance['title']) )
                         echo $args['before_title'] . $instance['title'] . $args['after_title'];
 
-                wp_nav_menu( array( 'fallback_cb' => '', 'menu' => $nav_menu ) );
+                $nav_menu_args = array(
+                        'fallback_cb' => '',
+                        'menu'        => $nav_menu
+                );
 
+                /**
+                 * Filter the arguments for the Custom Menu widget.
+                 *
+                 * @since 4.2.0
+                 *
+                 * @param array    $nav_menu_args {
+                 *     An array of arguments passed to wp_nav_menu() to retrieve a custom menu.
+                 *
+                 *     @type callback|bool $fallback_cb Callback to fire if the menu doesn't exist. Default empty.
+                 *     @type mixed         $menu        Menu ID, slug, or name.
+                 * }
+                 * @param stdClass $nav_menu      Nav menu object for the current menu.
+                 * @param array    $args          Display arguments for the current widget.
+                 */
+                wp_nav_menu( apply_filters( 'widget_nav_menu_args', $nav_menu_args, $nav_menu, $args ) );
+
                 echo $args['after_widget'];
         }