Customizer: Ensure `WP_Customize_Setting::update()` returns boolean value.

Adds unit tests for `WP_Customize_Setting::save()` (and `WP_Customize_Setting::update()`), along with the actions `customize_update_{$type}`, and `customize_save_{$id_base}` which they trigger.

Fixes #34140.

Built from https://develop.svn.wordpress.org/trunk@34838


git-svn-id: http://core.svn.wordpress.org/trunk@34803 1a063a9b-81f0-0310-95a4-ce76da25c4cd

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

@@ -304,12 +304,13 @@ class WP_Customize_Setting {
 	 * @since 3.4.0
 	 *
 	 * @param mixed $value The value to update.
-	 * @return mixed The result of saving the value.
+	 * @return bool The result of saving the value.
 	 */
 	protected function update( $value ) {
-		switch( $this->type ) {
+		switch ( $this->type ) {
 			case 'theme_mod' :
-				return $this->_update_theme_mod( $value );
+				$this->_update_theme_mod( $value );
+				return true;
 
 			case 'option' :
 				return $this->_update_option( $value );
@@ -327,7 +328,9 @@ class WP_Customize_Setting {
 				 * @param mixed                $value Value of the setting.
 				 * @param WP_Customize_Setting $this  WP_Customize_Setting instance.
 				 */
-				return do_action( 'customize_update_' . $this->type, $value, $this );
+				do_action( "customize_update_{$this->type}", $value, $this );
+
+				return has_action( "customize_update_{$this->type}" );
 		}
 	}
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34837';
+$wp_version = '4.4-alpha-34838';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.