GNU bug report logs - #72710
31.0.50; visual-wrap-prefix-mode freezes rendering in conjunction with diff-hl (fringe display)

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Message #8 received at 72710 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: "Mark Hepburn" <mark <at> markhepburn.com>, Jim Porter <jporterbugs <at> gmail.com>
Cc: 72710 <at> debbugs.gnu.org
Subject: Re: bug#72710: 31.0.50;
 visual-wrap-prefix-mode freezes rendering in conjunction with diff-hl
 (fringe display)
Date: Sat, 24 Aug 2024 12:01:16 +0300

> Date: Mon, 19 Aug 2024 22:15:51 +1000
> From: "Mark Hepburn" <mark <at> markhepburn.com>
> 
> Turning on the recently-merged visual-wrap-prefix-mode while using the
> fringe display of diff-hl (a mode to display uncommitted file changes in
> the fringe area) causes rendering to completely freeze.  No backtrace is
> reported, although subsequent visual-line-move commands produce an
> error.  Emacs itself is responsive, so the file can be re-opened with
> `find-alternate-file'.
> 
> To reproduce from emacs -Q:
> * Install diff-hl (clone https://github.com/dgutov/diff-hl/, add to
> load-path)
> * open a file under version control
> * M-x diff-hl-mode
> * make some edits, ensure the fringe shows the lines highlighted (I
> think it might need multiple lines affected)
> * M-x visual-wrap-prefix-mode
> 
> For me the effect varies between a blank unresponsive buffer and a
> buffer I can still see the contents (with the cursor frozen and
> appearing unselected), but either way it is unusable.
> 
> It seems to be the fringe display; the same experiment with a clean file
> had no effect.

Jim, could you please look into this?

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