[HttpFoundation] changed the strategy introduced in a5ccda47b4406518ee75929ce2e690b6998c021b to fix functional tests and still allow to call save more than once for a Session

Author: fabpot

EventListener/TestSessionListener.php

@@ -69,6 +69,7 @@ public function onKernelResponse(FilterResponseEvent $event)
 
         if ($session = $event->getRequest()->getSession()) {
             $session->save();
+            $session->close();
 
             $params = session_get_cookie_params();