Protect included code snippets from "recursive" highlighting#1441

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wioux wants to merge 2 commits intolsegal:mainfrom

wioux:parse_codeblocks_double_pass_guard

Commits on Jul 7, 2022

Add internal flag on highlighted <pre>s, to prevent them from being processed twice
wioux
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Add new tests with syntax highlighting/include:file expectations
wioux
committed