Theme Customizer: Remove background_image_thumb when saving settings.…

… fixes #20871.

This prevents the background_image and background_image_thumb settings from getting out of sync.
In 3.5 we can consider using background-size on Appearance > Background, eliminating _thumb.



git-svn-id: http://core.svn.wordpress.org/trunk@21053 1a063a9b-81f0-0310-95a4-ce76da25c4cd

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

@@ -781,6 +781,10 @@ public function register_controls() {
 			'theme_supports' => 'custom-background',
 		) );
 
+		$this->add_setting( new WP_Customize_Background_Image_Setting( $this, 'background_image_thumb', array(
+			'theme_supports' => 'custom-background',
+		) ) );
+
 		$this->add_control( new WP_Customize_Background_Image_Control( $this ) );
 
 		$this->add_setting( 'background_repeat', array(

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

@@ -382,7 +382,7 @@ public function update() {}
  *
  * Results should be properly handled using another setting or callback.
  */
-class WP_Customize_Header_Image_Setting extends WP_Customize_Setting {
+final class WP_Customize_Header_Image_Setting extends WP_Customize_Setting {
 	public $id = 'header_image_data';
 
 	public function update( $value ) {
@@ -398,4 +398,12 @@ public function update( $value ) {
 		else
 			$custom_image_header->set_header_image( $value );
 	}
-}
+}
+
+final class WP_Customize_Background_Image_Setting extends WP_Customize_Setting {
+	public $id = 'background_image_thumb';
+
+	public function update( $value ) {
+		remove_theme_mod( 'background_image_thumb' );
+	}
+}