Merge branch '2.3' into 2.7

* 2.3:
  remove unnecessary retrieval and setting of data
  avoid (string) catchable fatal error for __PHP_Incomplete_Class instances
  sendContent return as parent.
  [FrameworkBundle] Fix a typo

Author: fabpot

Extension/Csrf/EventListener/CsrfValidationListener.php

@@ -94,9 +94,10 @@ public function __construct($fieldName, $tokenManager, $tokenId, $errorMessage,
     public function preSubmit(FormEvent $event)
     {
         $form = $event->getForm();
-        $data = $event->getData();
 
         if ($form->isRoot() && $form->getConfig()->getOption('compound')) {
+            $data = $event->getData();
+
             if (!isset($data[$this->fieldName]) || !$this->tokenManager->isTokenValid(new CsrfToken($this->tokenId, $data[$this->fieldName]))) {
                 $errorMessage = $this->errorMessage;
 
@@ -109,10 +110,9 @@ public function preSubmit(FormEvent $event)
 
             if (is_array($data)) {
                 unset($data[$this->fieldName]);
+                $event->setData($data);
             }
         }
-
-        $event->setData($data);
     }
 
     /**