Made the include function safe for the autoescaping

This fixes a regression introduced in ba88c75557
Fixes #1097
merged branch stof/include_escaping (PR #1110)

This PR was merged into the master branch.

Discussion
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Made the include function safe for the autoescaping

This fixes a regression introduced in ba88c75557
Fixes #1097

I have not updated the changelog as the regression is not part of a release yet

Commits
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3bc113b Made the include function safe for the autoescaping