[FrameworkBundle] Fix relative paths used as cache keys #21237
Merged
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This bug fix is particularly important on 3.2, where the generated "templates.php" does contain relative paths. This turned out to generate a fatal error on our setup, because of non-normalized twig-cache keys. See also twigphp/Twig#2354
As a bonus, this saves us a copy-on-write on PHP 7.