Ticket #34947: 34947.1.diff

src/wp-includes/class-wp-customize-nav-menus.php

@@ -311 +311 @@
                         }
                 }
 
+                /**
+                 * Filter the available menu items during a search request.
+                 *
+                 * @since 4.5.0
+                 *
+                 * @param array $items The array of menu items.
+                 * @param array $args  Includes 'pagenum' and 's' (search) arguments.
+                 */
+                $items = apply_filters( 'customize_nav_menu_search_available_items', $items, $args );
+
                 return $items;
         }