[Twig] Escaping route names with backslashes

[freerich]

Since Symfony 6.4 we have route name aliases for invokable controllers. The autocomplete in Twig templates already provides those route aliases, for example in the path() function. But this kind of route aliases have backslashes, so the autocomplete works, but Twig won't like these unescaped strings.

It would be great if the route names were escaped automatically if you used this autocomplete in Twig.

More about this Symfony feature: https://symfony.com/blog/new-in-symfony-6-4-fqcn-based-routes