Merge branch '3.4' into 4.4

* 3.4:
  [ExpressionLanguage] Fixed collisions of character operators with object properties
  [Validator] Remove specific check for Valid targets
  [PhpUnitBridge] Use trait instead of extending deprecated class
  fix remember me
  Use strict assertion in asset tests
  [DoctrineBridge][DoctrineExtractor] Fix indexBy with custom and some core types
  Do not rely on the current locale when dumping a Graphviz object
  fix typo
  [Ldap] force default network timeout
  [Config] don't throw on missing excluded paths
  Docs: Typo, grammar
  [Validator] Add the missing translations for the Polish ("pl") locale
  [Console] Inline exact-match handling with 4.4
  Set previous exception when rethrown from controller resolver
  [VarDumper] fixed DateCaster not displaying additional fields
  [HttpKernel] fix registering DebugHandlersListener regardless of the PHP_SAPI

Author: fabpot

Adapter/ExtLdap/Connection.php

@@ -116,6 +116,10 @@ protected function configureOptions(OptionsResolver $resolver)
                 $options->setDefault('debug_level', 7);
             }
 
+            if (!isset($parent['network_timeout'])) {
+                $options->setDefault('network_timeout', ini_get('default_socket_timeout'));
+            }
+
             $options->setDefaults([
                 'protocol_version' => $parent['version'],
                 'referrals' => $parent['referrals'],