Customize: Prevent PHP notice and JS error caused by widgets and nav menus components if user only has `customize` capability.

Short-circuits components from initializing their hooks needlessly if current user lacks required capability.

Fixes #35895.

Built from https://develop.svn.wordpress.org/trunk@36611


git-svn-id: http://core.svn.wordpress.org/trunk@36578 1a063a9b-81f0-0310-95a4-ce76da25c4cd

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

@@ -48,6 +48,11 @@ final class WP_Customize_Nav_Menus {
 		$this->previewed_menus = array();
 		$this->manager         = $manager;
 
+		// Skip useless hooks when the user can't manage nav menus anyway.
+		if ( ! current_user_can( 'edit_theme_options' ) ) {
+			return;
+		}
+
 		add_filter( 'customize_refresh_nonces', array( $this, 'filter_nonces' ) );
 		add_action( 'wp_ajax_load-available-menu-items-customizer', array( $this, 'ajax_load_available_items' ) );
 		add_action( 'wp_ajax_search-available-menu-items-customizer', array( $this, 'ajax_search_available_items' ) );

wp-includes/class-wp-customize-widgets.php

@@ -84,6 +84,11 @@ final class WP_Customize_Widgets {
 	public function __construct( $manager ) {
 		$this->manager = $manager;
 
+		// Skip useless hooks when the user can't manage widgets anyway.
+		if ( ! current_user_can( 'edit_theme_options' ) ) {
+			return;
+		}
+
 		add_filter( 'customize_dynamic_setting_args',          array( $this, 'filter_customize_dynamic_setting_args' ), 10, 2 );
 		add_action( 'after_setup_theme',                       array( $this, 'register_settings' ) );
 		add_action( 'wp_loaded',                               array( $this, 'override_sidebars_widgets_for_theme_switch' ) );

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-36610';
+$wp_version = '4.5-alpha-36611';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.