Ticket #25444: 25444.1.diff

src/wp-admin/customize.php

@@ -172 +172 @@
         if ( is_ssl() && ! $cross_domain )
                 $allowed_urls[] = home_url( '/', 'https' );
 
+        /**
+         * Filter the allowed URLS.
+         *
+         * @since 3.4.0
+         *
+         * @param array $allowed_urls An array of allowed URLs.
+         */
         $allowed_urls = array_unique( apply_filters( 'customize_allowed_urls', $allowed_urls ) );
 
         $fallback_url = add_query_arg( array(