Ticket #20448: 20448.13.diff

wp-includes/post-template.php

@@ -501 +501 @@
         if ( is_admin_bar_showing() )
                 $classes[] = 'admin-bar';
 
-        if ( get_background_color() || get_theme_mod( 'background_image' ) || get_theme_support( 'custom-background', 'default-image' ) )
+        if ( get_theme_mod( 'background_color' ) || get_background_image() || current_theme_supports( 'custom-background', 'default-image' ) )
                 $classes[] = 'custom-background';
 
         $page = $wp_query->get( 'page' );