Merge branch '2.8' into 3.4

* 2.8:
  update test for Twig performance optimizations
  [WebProfilerBundle] Increase retry delays between toolbarAction ajax calls
  support sapi_windows_vt100_support for php 7.2+
  bumped Symfony version to 2.8.35
  updated VERSION for 2.8.34
  updated CHANGELOG for 2.8.34
  bumped Symfony version to 2.7.42
  updated VERSION for 2.7.41
  update CONTRIBUTORS for 2.7.41
  updated CHANGELOG for 2.7.41
  [HttpFoundation] Added "null" type on Request::create docblock
  Allow trans filter to be safe

Author: nicolas-grekas

Output/StreamOutput.php

@@ -92,7 +92,8 @@ protected function hasColorSupport()
     {
         if (DIRECTORY_SEPARATOR === '\\') {
             return
-                '10.0.10586' === PHP_WINDOWS_VERSION_MAJOR.'.'.PHP_WINDOWS_VERSION_MINOR.'.'.PHP_WINDOWS_VERSION_BUILD
+                function_exists('sapi_windows_vt100_support') && sapi_windows_vt100_support($this->stream)
+                || '10.0.10586' === PHP_WINDOWS_VERSION_MAJOR.'.'.PHP_WINDOWS_VERSION_MINOR.'.'.PHP_WINDOWS_VERSION_BUILD
                 || false !== getenv('ANSICON')
                 || 'ON' === getenv('ConEmuANSI')
                 || 'xterm' === getenv('TERM');