GNU bug report logs - #46238
27.1; recenter-top-bottom in fullscreen

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Colin Okay <okay <at> toyful.space>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1; recenter-top-bottom in fullscreen
Date: Mon, 01 Feb 2021 09:32:29 -0600

When in fullscreen mode, recenter-top-bottom fails to toggle to the
"bottom" position. Pressing C-l with the cursor at the top will recenter
the window with the cursor in the middle, pressing it again does
nothing, and pressing it one more time will recenter the window with the
cursor at the top. The quirk is not present when emacs is not in
fullscreen mode.


In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.23, cairo version 1.16.0)
 of 2020-11-07, modified by Debian built on x86-ubc-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12010000
System Description: Debian GNU/Linux bullseye/sid

Configured using:
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Message #8 received at 46238 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Colin Okay <okay <at> toyful.space>, 46238 <at> debbugs.gnu.org
Subject: Re: bug#46238: 27.1; recenter-top-bottom in fullscreen
Date: Tue, 2 Feb 2021 09:42:28 +0100

> When in fullscreen mode, recenter-top-bottom fails to toggle to the
> "bottom" position. Pressing C-l with the cursor at the top will recenter
> the window with the cursor in the middle, pressing it again does
> nothing, and pressing it one more time will recenter the window with the
> cursor at the top. The quirk is not present when emacs is not in
> fullscreen mode.
>
>
> In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.23, cairo version 1.16.0)
>   of 2020-11-07, modified by Debian built on x86-ubc-01
> Windowing system distributor 'The X.Org Foundation', version 11.0.12010000
> System Description: Debian GNU/Linux bullseye/sid

Thanks for the report.  I tried to reproduce this with emacs -Q, F11 and
a sufficiently large .el buffer using a GTK3 build for Debian 10 but
failed.  After a third invocation, 'recenter-top-bottom' moves point to
a position somewhere at the bottom of the window.  Is that the idea of
the function (I never used it before) or should it do something else?

Reading it for the first time, 'recenter-top-bottom' has an incredibly
misleading doc-string: For me "Move current buffer line to the specified
window line" means to (1) remove the buffer line at point from its
buffer and (2) reinsert it at the window line specified by ARG but I
doubt that that's the intended behavior.  Maybe someone more
knowledgeable could make it more reasonable, maybe stealing text like
"positions the current line at the top of the window" from 'recenter'.

In either case, please try to reproduce the behavior you see with emacs
-Q and maybe some trivial buffer (whose contents you could also post
here).  Then please edebug 'recenter-top-bottom' and try to find out
where it fails in comparison with say a maximized or normal window.  In
particular we'd have to know the value of 'recenter-last-op' in the
invocation where it fails.  Then you could try to feed the failing
argument into 'recenter' itself and look whether it fails there as well.

Thanks, martin

Message #11 received at 46238 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: martin rudalics <rudalics <at> gmx.at>
Cc: okay <at> toyful.space, 46238 <at> debbugs.gnu.org
Subject: Re: bug#46238: 27.1; recenter-top-bottom in fullscreen
Date: Tue, 02 Feb 2021 17:20:19 +0200

> From: martin rudalics <rudalics <at> gmx.at>
> Date: Tue, 2 Feb 2021 09:42:28 +0100
> 
> Reading it for the first time, 'recenter-top-bottom' has an incredibly
> misleading doc-string: For me "Move current buffer line to the specified
> window line" means to (1) remove the buffer line at point from its
> buffer and (2) reinsert it at the window line specified by ARG but I
> doubt that that's the intended behavior.  Maybe someone more
> knowledgeable could make it more reasonable, maybe stealing text like
> "positions the current line at the top of the window" from 'recenter'.

Is the below better?

  "Scroll the window so that current line is at the middle of the window.
Successive invocations scroll the window in a cyclical order to put
the current line at certain places within the window, as determined by
`recenter-positions'.  By default, the second invocation puts the
current line at the top-most window line, the third invocation puts it
on the bottom-most window line, and then the order is reused.

With numeric prefix ARG, move current line ARG lines below the window top.
With plain `C-u', move current line to window center."

Message #14 received at 46238 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: okay <at> toyful.space, 46238 <at> debbugs.gnu.org
Subject: Re: bug#46238: 27.1; recenter-top-bottom in fullscreen
Date: Tue, 2 Feb 2021 17:03:39 +0100

> Is the below better?

It's perfect for me.

Thanks, martin

Message #17 received at 46238 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: martin rudalics <rudalics <at> gmx.at>
Cc: okay <at> toyful.space, 46238 <at> debbugs.gnu.org
Subject: Re: bug#46238: 27.1; recenter-top-bottom in fullscreen
Date: Tue, 02 Feb 2021 18:26:24 +0200

> Cc: okay <at> toyful.space, 46238 <at> debbugs.gnu.org
> From: martin rudalics <rudalics <at> gmx.at>
> Date: Tue, 2 Feb 2021 17:03:39 +0100
> 
> > Is the below better?
> 
> It's perfect for me.

Thanks, installed on the release branch.

Message #20 received at 46238 <at> debbugs.gnu.org (full text, mbox):

From: Drew Adams <drew.adams <at> oracle.com>
To: Eli Zaretskii <eliz <at> gnu.org>, martin rudalics <rudalics <at> gmx.at>
Cc: "okay <at> toyful.space" <okay <at> toyful.space>,
 "46238 <at> debbugs.gnu.org" <46238 <at> debbugs.gnu.org>
Subject: RE: [External] : bug#46238: 27.1; recenter-top-bottom in fullscreen
Date: Tue, 2 Feb 2021 16:46:46 +0000

> Is the below better?
> 
>   "Scroll the window so that current line is at the middle of the
> window.
> Successive invocations scroll the window in a cyclical order to put
> the current line at certain places within the window, as determined by
> `recenter-positions'.  By default, the second invocation puts the
> current line at the top-most window line, the third invocation puts it
> on the bottom-most window line, and then the order is reused.
> 
> With numeric prefix ARG, move current line ARG lines below the window
> top.
> With plain `C-u', move current line to window center."

+1

Message #23 received at 46238 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: okay <at> toyful.space, martin rudalics <rudalics <at> gmx.at>, 46238 <at> debbugs.gnu.org
Subject: Re: bug#46238: 27.1; recenter-top-bottom in fullscreen
Date: Tue, 20 Apr 2021 22:04:00 -0500

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Cc: okay <at> toyful.space, 46238 <at> debbugs.gnu.org
>> From: martin rudalics <rudalics <at> gmx.at>
>> Date: Tue, 2 Feb 2021 17:03:39 +0100
>>
>> > Is the below better?
>>
>> It's perfect for me.
>
> Thanks, installed on the release branch.

It seems like this was fixed.  Should this be closed or is there more to
do here?

Message #26 received at 46238 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Stefan Kangas <stefan <at> marxist.se>, Eli Zaretskii <eliz <at> gnu.org>
Cc: okay <at> toyful.space, 46238 <at> debbugs.gnu.org
Subject: Re: bug#46238: 27.1; recenter-top-bottom in fullscreen
Date: Wed, 21 Apr 2021 09:03:02 +0200

> It seems like this was fixed.  Should this be closed or is there more to
> do here?

It should be closed.

martin

Message #31 received at 46238-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: okay <at> toyful.space, rudalics <at> gmx.at, 46238-done <at> debbugs.gnu.org
Subject: Re: bug#46238: 27.1; recenter-top-bottom in fullscreen
Date: Wed, 21 Apr 2021 11:51:49 +0300

> From: Stefan Kangas <stefan <at> marxist.se>
> Date: Tue, 20 Apr 2021 22:04:00 -0500
> Cc: martin rudalics <rudalics <at> gmx.at>, okay <at> toyful.space, 46238 <at> debbugs.gnu.org
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> Cc: okay <at> toyful.space, 46238 <at> debbugs.gnu.org
> >> From: martin rudalics <rudalics <at> gmx.at>
> >> Date: Tue, 2 Feb 2021 17:03:39 +0100
> >>
> >> > Is the below better?
> >>
> >> It's perfect for me.
> >
> > Thanks, installed on the release branch.
> 
> It seems like this was fixed.  Should this be closed or is there more to
> do here?

No; closing.

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