Merge branch '4.3' into 4.4

* 4.3:
  [Debug] fix ClassNotFoundFatalErrorHandler
  [Routing] Fix using a custom matcher & generator dumper class
  [Dotenv] Fixed infinite loop with missing quote followed by quoted value
  [HttpClient] Added missing sprintf
  [TwigBridge] button_widget now has its title attr translated even if its label = null or false
  [PhpUnitBridge] When using phpenv + phpenv-composer plugin, composer executable is wrapped into a bash script
  [Messenger] Added check if json_encode succeeded
  [Security] Prevent canceled remember-me cookie from being accepted
  [FrameworkBundle][TranslationUpdateCommand] Do not output positive feedback on stderr
  [Security\Guard] Fix missing typehints

Author: nicolas-grekas

bin/simple-phpunit.php

@@ -106,7 +106,7 @@
     || ($COMPOSER = rtrim('\\' === DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer.phar`) : `which composer.phar 2> /dev/null`))
     || ($COMPOSER = rtrim('\\' === DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer`) : `which composer 2> /dev/null`))
     || file_exists($COMPOSER = rtrim('\\' === DIRECTORY_SEPARATOR ? `git rev-parse --show-toplevel 2> NUL` : `git rev-parse --show-toplevel 2> /dev/null`).DIRECTORY_SEPARATOR.'composer.phar')
-    ? $PHP.' '.escapeshellarg($COMPOSER)
+    ? (file_get_contents($COMPOSER, null, 0, 18) === '#!/usr/bin/env php' ? $PHP : '').' '.escapeshellarg($COMPOSER) // detect shell wrappers by looking at the shebang
     : 'composer';
 
 $SYMFONY_PHPUNIT_REMOVE = $getEnvVar('SYMFONY_PHPUNIT_REMOVE', 'phpspec/prophecy'.($PHPUNIT_VERSION < 6.0 ? ' symfony/yaml': ''));