bug#51016: 28.0.50; 'diff-font-lock-prettify' breaks display of outline headers

[Lars Ingebrigtsen]

Matthias Meulien <orontee@gmail.com> writes:

> I updated the patch after a week using it. Outlines headers are now
> updated for diff comming from Git even when diff-font-lock-prettify is
> nil.

Thanks for the patch and the thorough case for reproduction.  I've now
applied it to Emacs 29 (with some trivial changes).

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