GNU bug report logs - #76186
31.0.50; (recenter 0) sometimes does not recenter as expected

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Message #86 received at 76186 <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 76186 <at> debbugs.gnu.org, Markus Triska <triska <at> metalevel.at>
Subject: Re: bug#76186: 31.0.50; (recenter 0) sometimes does not recenter as
 expected
Date: Sun, 16 Mar 2025 14:20:33 +0100

[Message part 1 (text/plain, inline)]

On Sat, 15 Mar 2025 14:36:29 +0200 Eli Zaretskii <eliz <at> gnu.org> wrote:

>> From: Markus Triska <triska <at> metalevel.at>
>> Cc: stephen.berman <at> gmx.net,  76186 <at> debbugs.gnu.org
>> Date: Sat, 15 Mar 2025 12:28:17 +0100
>>
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>>
>> > Ping!  Do we still need to discuss this issue?  Or can it be closed,
>> > given my explanations below?
>>
>> I can still reproduce the problem on 3 different Emacs installations
>> (Debian, Ubuntu and OSX), and I would prefer this issue only to be
>> closed when Emacs handles the example reliably because I consider it
>> unsaticsfactory that recentering sometimes work, and sometimes not.
>
> I thought I explained why this cannot be done as reliably as you
> expect it to be.
>
>> The other remaining question is why you cannot reproduce the issue with
>> your configuration whereas Steve and I can do so on ours.
>
> I don't know.

Although you already said upthread you could not reproduce the issue
with the test code I posted, I'd ask you to try again with the attached
file, i.e. from the shell:

emacs -Q -l bug#76186.el

This file differs from the one I posted upthread only in that the first
occurrence of `(redisplay)' is commented out, so possibly you overlooked
that when you tested previously (my explanation of my testing was a bit
terse).  With that difference I consistently get the unexpected
recentering after a single iteration.  What's more, I've now also
reproduced this with emacs-30 running under MS-Windows 10 in a virtual
machine (I used emacs-30.1-installer.exe downloaded from a GNU mirror).
Perhaps I missed something when debugging this, so if you can also
reproduce it, you might be able to debug it better than I did.

Steve Berman

[bug#76186.el (application/emacs-lisp, attachment)]

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