Merge branch '4.4'

* 4.4:
  add back possibility to use form themes without translations
  [HttpClient] fix Psr18Client handling of non-200 response codes
  [HttpClient] make Psr18Client implement relevant PSR-17 factories
  [WebProfilerBundle] fix FC with HttpFoundation v5
  [OptionsResolver] fix adding $triggerDeprecation to Options::offsetGet()
  [Form] test case is not legacy
  Fix reporting unsilenced deprecations from insulated tests
  Changed EventDispatcherInterface dependency from Component to Contracts
  fix handling nested embeddables
  [WebProfilerBundle] Select default theme based on user preferences
  [FrameworkBundle] Allow dots in translation domains
  Added FormInterface to @return Form::getClickedButton docblock

Author: nicolas-grekas

Legacy/SymfonyTestsListenerTrait.php

@@ -284,7 +284,8 @@ public function endTest($test, $time)
             foreach ($deprecations ? unserialize($deprecations) : array() as $deprecation) {
                 $error = serialize(array('deprecation' => $deprecation[1], 'class' => $className, 'method' => $test->getName(false), 'triggering_file' => isset($deprecation[2]) ? $deprecation[2] : null));
                 if ($deprecation[0]) {
-                    @trigger_error($error, E_USER_DEPRECATED);
+                    // unsilenced on purpose
+                    trigger_error($error, E_USER_DEPRECATED);
                 } else {
                     @trigger_error($error, E_USER_DEPRECATED);
                 }