bug #9639 Modified guessDefaultEscapingStrategy to not escape txt templates (fabpot)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #9639).

Discussion
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Modified guessDefaultEscapingStrategy to not escape txt templates

This PR was submitted on the symfony/TwigBundle read-only repository and moved automatically to the main Symfony repository (closes symfony/twig-bundle#2).

Useful for plaintext emails.

Commits
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6affe94 Modified guessDefaultEscapingStrategy to not escape txt templates

Author: fabpot

src/Symfony/Bundle/TwigBundle/TwigEngine.php

@@ -57,6 +57,10 @@ public function guessDefaultEscapingStrategy($filename)
         if ('js' === $format) {
             return 'js';
         }
+        
+        if ('txt' === $format) {
+            return false;
+        }
 
         return 'html';
     }