Editor: opt out of Navigation fallback.

Allows developers to opt out of the auto-creation of the Navigation fallback through a filter.

Props get_dave, spacedmonkey, ramonopoly.
Fixes #58750.

Built from https://develop.svn.wordpress.org/trunk@56202


git-svn-id: http://core.svn.wordpress.org/trunk@55714 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-navigation-fallback.php

@@ -26,9 +26,18 @@ class WP_Navigation_Fallback {
 	 */
 	public static function get_fallback() {
 
+		/**
+		 * Filters whether or not a fallback should be created.
+		 *
+		 * @since 6.3.0
+		 *
+		 * @param bool Whether to create a fallback navigation menu. Default true.
+		 */
+		$should_create_fallback = apply_filters( 'wp_navigation_should_create_fallback', true );
+
 		$fallback = static::get_most_recently_published_navigation();
 
-		if ( $fallback ) {
+		if ( $fallback || ! $should_create_fallback ) {
 			return $fallback;
 		}
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-beta3-56201';
+$wp_version = '6.3-beta3-56202';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.