Ticket #57020: 57020.patch

src/wp-content/themes/twentyeleven/functions.php

@@ -213 +213 @@
                         define( 'HEADER_IMAGE_WIDTH', $custom_header_support['width'] );
                         define( 'HEADER_IMAGE_HEIGHT', $custom_header_support['height'] );
                         add_custom_image_header( $custom_header_support['wp-head-callback'], $custom_header_support['admin-head-callback'], $custom_header_support['admin-preview-callback'] );
-                        add_custom_background();
+                        add_theme_support( 'custom-background' );
                 }
 
                 /*