Issue #2567139 by Cottser, stefan.r, joelpittet: Twig autoescape default...

Issue #2567139 by Cottser, stefan.r, joelpittet: Twig autoescape default strategy deprecation error triggered on every page load

core/lib/Drupal/Core/Template/TwigEnvironment.php

@@ -82,7 +82,7 @@ public function __construct($root, CacheBackendInterface $cache, $twig_extension
       'auto_reload' => NULL,
     );
     // Ensure autoescaping is always on.
-    $options['autoescape'] = TRUE;
+    $options['autoescape'] = 'html';
 
     $this->loader = $loader;
     parent::__construct($this->loader, $options);

core/tests/Drupal/Tests/Core/Template/TwigExtensionTest.php

@@ -33,7 +33,7 @@ public function testEscaping($template, $expected) {
     $twig = new \Twig_Environment(NULL, array(
       'debug' => TRUE,
       'cache' => FALSE,
-      'autoescape' => TRUE,
+      'autoescape' => 'html',
       'optimizations' => 0
     ));
     $twig->addExtension((new TwigExtension($renderer))->setUrlGenerator($this->getMock('Drupal\Core\Routing\UrlGeneratorInterface')));
@@ -113,7 +113,7 @@ public function testSafeStringEscaping() {
     $twig = new \Twig_Environment(NULL, array(
       'debug' => TRUE,
       'cache' => FALSE,
-      'autoescape' => TRUE,
+      'autoescape' => 'html',
       'optimizations' => 0
     ));
     $twig_extension = new TwigExtension($renderer);