[likely a bug] diff highlighting not shown for Akkoma post edits

[nehemiagurl]

when viewing this post from a Mastodon instance in Tusky, all versions of the post are visible in edit history, and one can see the text differences, but those differences are not highlighted.

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• Tusky Version: 24.1

• Android Version: 12

• Android Device: Galaxy A12

• Mastodon instance (if applicable): tooot.im

• I searched or browsed the repo’s other issues to ensure this is not a duplicate.

[connyduck]

The posts contains HTML that the diff library fails to parse (specifically: unescaped "s outside of html tags). I think falling back to no diff is actually the best possible behavior here.