Merge branch '2.3' into 2.6

* 2.3:
  Minor fixes
  Towards 100% HHVM compat
  trigger event with right user (add test)
  [Security] Initialize SwitchUserEvent::targetUser on attemptExitUser
  [Form] Fixed: Data mappers always receive forms indexed by their names

Conflicts:
	src/Symfony/Component/Debug/Tests/ErrorHandlerTest.php
	src/Symfony/Component/Filesystem/Filesystem.php
	src/Symfony/Component/Process/Tests/AbstractProcessTest.php

Author: nicolas-grekas

Form.php

@@ -916,7 +916,7 @@ public function add($child, $type = null, array $options = array())
         $child->setParent($this);
 
         if (!$this->lockSetData && $this->defaultDataSet && !$this->config->getInheritData()) {
-            $iterator = new InheritDataAwareIterator(new \ArrayIterator(array($child)));
+            $iterator = new InheritDataAwareIterator(new \ArrayIterator(array($child->getName() => $child)));
             $iterator = new \RecursiveIteratorIterator($iterator);
             $this->config->getDataMapper()->mapDataToForms($viewData, $iterator);
         }

Tests/CompoundFormTest.php

@@ -350,7 +350,7 @@ public function testAddMapsViewDataToFormIfInitialized()
             ->with('bar', $this->isInstanceOf('\RecursiveIteratorIterator'))
             ->will($this->returnCallback(function ($data, \RecursiveIteratorIterator $iterator) use ($child, $test) {
                 $test->assertInstanceOf('Symfony\Component\Form\Util\InheritDataAwareIterator', $iterator->getInnerIterator());
-                $test->assertSame(array($child), iterator_to_array($iterator));
+                $test->assertSame(array($child->getName() => $child), iterator_to_array($iterator));
             }));
 
         $form->initialize();

Tests/Extension/Core/DataTransformer/DateTimeTestCase.php

@@ -15,6 +15,6 @@ abstract class DateTimeTestCase extends \PHPUnit_Framework_TestCase
 {
     public static function assertDateTimeEquals(\DateTime $expected, \DateTime $actual)
     {
-        self::assertEquals($expected->format('c'), $actual->format('c'));
+        self::assertEquals($expected->format('U'), $actual->format('U'));
     }
 }