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

[Lars Ingebrigtsen]

Juri Linkov <juri@linkov.net> writes:

> This patch broke vc-diff.  For example, after 'C-x v L' type 'd',
> and check that *vc-diff* buffer doesn't have buffer-local variables
> diff-vc-backend, diff-vc-revisions anymore, because they were defined
> in vc-diff-internal after diff-mode, but now the postponed diff-mode
> kills these buffer-local variables:
>
>      (set-buffer buffer)
> -    (diff-mode)
>      (setq-local diff-vc-backend (car vc-fileset))
>      (setq-local diff-vc-revisions (list rev1 rev2))

Right.  Matthias -- can this be fixed in a different way that doesn't
postpone changing the major mode?

-- 
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   bloggy blog: http://lars.ingebrigtsen.no