Ticket #17353: 17353.diff

wp-admin/custom-header.php

@@ -241 +241 @@
                         return;
 
                 $this->default_headers = $_wp_default_headers;
+                $template_directory_uri = get_template_directory_uri();
+                $stylesheet_directory_uri = get_stylesheet_directory_uri();
                 foreach ( array_keys($this->default_headers) as $header ) {
-                        $this->default_headers[$header]['url'] =  sprintf( $this->default_headers[$header]['url'], get_template_directory_uri(), get_stylesheet_directory_uri() );
-                        $this->default_headers[$header]['thumbnail_url'] =  sprintf( $this->default_headers[$header]['thumbnail_url'], get_template_directory_uri(), get_stylesheet_directory_uri() );
+                        $this->default_headers[$header]['url'] =  sprintf( $this->default_headers[$header]['url'], $template_directory_uri, $stylesheet_directory_uri );
+                        $this->default_headers[$header]['thumbnail_url'] =  sprintf( $this->default_headers[$header]['thumbnail_url'], $template_directory_uri, $stylesheet_directory_uri );
                 }
 
         }