Customizer: Re-use list of components to eliminate code duplication.

Introduces protected `WP_Customize_Manager::$components` to store list of loaded core components filtered by `customize_loaded_components`.

Props DrewAPicture.
See #35242
See #33552.
Fixes #35354.

Built from https://develop.svn.wordpress.org/trunk@36262


git-svn-id: http://core.svn.wordpress.org/trunk@36229 1a063a9b-81f0-0310-95a4-ce76da25c4cd

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

@@ -93,6 +93,15 @@ final class WP_Customize_Manager {
 	 */
 	protected $panels = array();
 
+	/**
+	 * List of core components.
+	 *
+	 * @since 4.5.0
+	 * @access protected
+	 * @var array
+	 */
+	protected $components = array( 'widgets', 'nav_menus' );
+
 	/**
 	 * Registered instances of WP_Customize_Section.
 	 *
@@ -238,7 +247,7 @@ final class WP_Customize_Manager {
 		 * @param array                $components List of core components to load.
 		 * @param WP_Customize_Manager $this       WP_Customize_Manager instance.
 		 */
-		$components = apply_filters( 'customize_loaded_components', array( 'widgets', 'nav_menus' ), $this );
+		$components = apply_filters( 'customize_loaded_components', $this->components, $this );
 
 		if ( in_array( 'widgets', $components ) ) {
 			require_once( ABSPATH . WPINC . '/class-wp-customize-widgets.php' );
@@ -1198,12 +1207,8 @@ final class WP_Customize_Manager {
 	 * @param string $id Panel ID to remove.
 	 */
 	public function remove_panel( $id ) {
-		$core_panels = array(
-			'widgets',
-			'nav_menus',
-		);
-
-		if ( in_array( $id, $core_panels, true ) ) {
+		// Removing core components this way is _doing_it_wrong().
+		if ( in_array( $id, $this->components, true ) ) {
 			/* translators: 1: panel id, 2: filter reference URL, 3: filter name */
 			$message = sprintf( __( 'Removing %1$s manually will cause PHP warnings. Use the <a href="%2$s">%3$s</a> filter instead.' ),
 				$id,

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-36261';
+$wp_version = '4.5-alpha-36262';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.