Improve @mention sanitizer for for verbatim backticks in code blocks #1427
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This PR improves
LinkAndMentionSanitizer
so that it understands code fences with verbatim backticks which would normally derail the matching logic. Basically, the rule behind backtick code fences seems to be that the outermost delimiter is the one with most backticks, so we need to find the next occurrence with the same number of backticks in order to find the end of the code fence (see spec, confirmed in GitHub comment editor preview).Example:
Related to #1421
cc @feelepxyz