fix: escape ambiguous Mfm marks from html
What does this PR do?
Fix #10918 (closed) within the constraints of MfM
<plain></plain>
is definitely a bad markup, but MfM doesn't provide any other way to escape the markup...
This isn't a perfect fix, and in the extreme case, if someone happens to be discussing MfM in a mastodon post and writes a </plain>
, it will break the fix, but there's nothing we can do about it unless we switch to a full-fledged Markdown parser.
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Edited by Linca