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

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

[Mark Hepburn]

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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.


In GNU Emacs 31.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version
3.24.41, cairo version 1.18.0) of 2024-08-18 built on x1carbon
Repository revision: 909d1d02db1c11e1309316cba2a392e1456e6053
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101011
System Description: Ubuntu 24.04 LTS

Configured using:
'configure --with-native-compilation --without-mailutils
--with-xwidgets --with-tree-sitter --with-libsystemd
--prefix=/home/mark/.local'

Configured features:
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Important settings:
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Major mode: Magit

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/home/mark/.emacs.d/elpa/editorconfig-20240813.801/editorconfig-tools hides /home/mark/.local/share/emacs/31.0.50/lisp/editorconfig-tools
/home/mark/.emacs.d/elpa/editorconfig-20240813.801/editorconfig-conf-mode hides /home/mark/.local/share/emacs/31.0.50/lisp/editorconfig-conf-mode
/home/mark/.emacs.d/elpa/hierarchy-20190425.842/hierarchy hides /home/mark/.local/share/emacs/31.0.50/lisp/emacs-lisp/hierarchy

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

[Eli Zaretskii]

> Date: Mon, 19 Aug 2024 22:15:51 +1000
> From: "Mark Hepburn" <mark@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?

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

[Jim Porter]

On 8/24/2024 2:01 AM, Eli Zaretskii wrote:
>> Date: Mon, 19 Aug 2024 22:15:51 +1000
>> From: "Mark Hepburn" <mark@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'.
[snip]
> Jim, could you please look into this?

This sounds like bug#72721. Mark, could you try applying Eli's patch 
here and see if it fixes the bug? 
<https://lists.gnu.org/archive/html/bug-gnu-emacs/2024-08/msg00919.html>

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

[Mark Hepburn]

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Thanks Jim, that does seem to work for me.

On Sun, Aug 25, 2024, at 2:29 AM, Jim Porter wrote:
> On 8/24/2024 2:01 AM, Eli Zaretskii wrote:
> >> Date: Mon, 19 Aug 2024 22:15:51 +1000
> >> From: "Mark Hepburn" <mark@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'.
> [snip]
> > Jim, could you please look into this?
> 
> This sounds like bug#72721. Mark, could you try applying Eli's patch 
> here and see if it fixes the bug? 
> <https://lists.gnu.org/archive/html/bug-gnu-emacs/2024-08/msg00919.html>
> 

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

[Eli Zaretskii]

merge 72710 72721
thanks

> Date: Sun, 25 Aug 2024 10:11:48 +1000
> From: "Mark Hepburn" <mark@markhepburn.com>
> Cc: 72710@debbugs.gnu.org
> 
> Thanks Jim, that does seem to work for me.

Thanks, I'm therefore merging these two bugs.