Ticket #28687: 28687.diff

custom-background.php

@@ -204 +204 @@
                         set_theme_mod('background_attachment', $attachment);
                 }
 
-                if ( isset($_POST['background-color']) ) {
-                        check_admin_referer('custom-background');
-                        $color = preg_replace('/[^0-9a-fA-F]/', '', $_POST['background-color']);
+                if ( get_theme_support( 'custom-background', 'default-color' ) == $color ) {
+                        remove_theme_mod( 'background_color' );
+                } else {
                         if ( strlen($color) == 6 || strlen($color) == 3 )
                                 set_theme_mod('background_color', $color);
                         else