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

[Lars Ingebrigtsen]

Matthias Meulien <orontee@gmail.com> writes:

> I suggest to restore the original call to `diff-mode` (before the
> asynchronous operation completes) and keep the initialization of
> `diff-buffer-type` by searching but make it available to
> `vc-diff-finish' which is called when the asynchronous operation
> completes.
>
> See the attached patch for details.

Thanks; this fixes the problem reported by Juri (as far as I can see
after doing some light testing), so I've now pushed the patch to Emacs
29.

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