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


From: Juri Linkov
Subject: bug#51016: 28.0.50; 'diff-font-lock-prettify' breaks display of outline headers
Date: Thu, 18 Nov 2021 20:06:31 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (x86_64-pc-linux-gnu)

>> 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).

As noticed in bug#51809, outline-cycle is not bound on hunk headings anymore,
only on file headings.  It seems the problem is somewhere here:

    (setq diff-outline-regexp
          (concat "\\(^diff --git.*\n\\|" diff-hunk-header-re "\\)"))

But I don't know why diff-hunk-header-re doesn't match hunk headings
in outline-minor-mode.





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