Ticket #26819: 26819.2.patch

src/wp-includes/formatting.php

@@ -3621 +3621 @@
  * @return string Absolute path.
  */
 function wp_make_link_relative( $link ) {
-        return preg_replace( '|^(https?:)?//[^/]+(/.*)|i', '$2', $link );
+        return preg_replace( '|^(https?:)?//[^/]+(/?.*)|i', '$2', $link );
 }
 
 /**