GNU bug report logs - #76538
31.0.50; 31.0.50; 31.0.50; feature/igc: using magit-section-cycle-global (S-TAB) and magit-section-toggle (TAB) in some random ways blocks GNU Emacs.

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Package: emacs;

Reported by: João Moreira <joaomoreira <at> gmx.se>

Date: Tue, 25 Feb 2025 03:42:01 UTC

Severity: normal

Found in version 31.0.50

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From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Ihor Radchenko <yantar92 <at> posteo.net>
Cc: pipcet <at> protonmail.com, eller.helmut <at> gmail.com, Stefan Monnier <monnier <at> iro.umontreal.ca>, joaomoreira <at> gmx.se, 76538 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: bug#76538: 31.0.50; 31.0.50; 31.0.50; feature/igc: using magit-section-cycle-global (S-TAB) and magit-section-toggle (TAB) in some random ways blocks GNU Emacs.
Date: Thu, 27 Feb 2025 20:33:01 +0100

Ihor Radchenko <yantar92 <at> posteo.net> writes:

> Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:
>
>> Stefan Monnier <monnier <at> iro.umontreal.ca> writes:
>>
>>> Maybe if we change the `DO_MARKERS` iteration to scan from the end,
>>> we'd recover a behavior much closer to what we see on `master`.
>>> Gerd?
>>
>> I don't know, but it might well be that one order is as bad as the
>> other, depending on the order in which markers are added to and removed
>> from the marker array. And I have no intuition what a marker array ends
>> up looking like in a typical use case, alas.
>>
>> Hm. Can we record the insertion order somehow? I guess that's what the
>> heuristic is using? 
>
> FYI, I tried various tweaks to that loop while debugging and concluded
> that DO_MARKERS loop is not the main bottleneck in this particular bug
> report.
>
> I am wondering if anyone else is able to reproduce the problem locally.

I haven't tried the OP's recipe, but I know that Magit can get really
slow, things taking minutes. An example would be a large merge of
several hundred files, and with conflicts. The status buffer becomes
as good as unusable then. I don't think this started with igc.
This bug report was last modified 106 days ago.

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