Ticket #29071: 29071.diff

src/wp-includes/theme.php

@@ -1902 +1902 @@
                 || ( is_admin() && 'customize.php' == basename( $_SERVER['PHP_SELF'] ) )
         ) )
                 return;
+        wp_bootstrap_customize_manager();
+}
+add_action( 'plugins_loaded', '_wp_customize_include' );
 
+/**
+ * Include the WP_Customize_Manager class and instantiate it into the wp_customize global.
+ *
+ * @since 4.0.0
+ */
+function wp_bootstrap_customize_manager() {
         require( ABSPATH . WPINC . '/class-wp-customize-manager.php' );
         // Init Customize class
         $GLOBALS['wp_customize'] = new WP_Customize_Manager;
 }
-add_action( 'plugins_loaded', '_wp_customize_include' );
 
 /**
  * Adds settings for the customize-loader script.