Ticket #22030: 22030.1.2.diff

wp-admin/custom-background.php

@@ -169 +169 @@
                 if ( isset($_POST['background-color']) ) {
                         check_admin_referer('custom-background');
                         $color = preg_replace('/[^0-9a-fA-F]/', '', $_POST['background-color']);
-                        if ( strlen($color) == 6 || strlen($color) == 3 )
-                                set_theme_mod('background_color', $color);
+                        if ( ( strlen( $color ) == 6 || strlen( $color ) == 3 ) && get_theme_support( 'custom-background', 'default-color' ) != $color )
+                                set_theme_mod( 'background_color', $color );
                         else
-                                set_theme_mod('background_color', '');
+                                remove_theme_mod( 'background_color' );
                 }
 
                 $this->updated = true;