GNU bug report logs - #76751
31.0.50; Bad window sizing with pgtk (bisected)

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

From: Jonathan Corbet <corbet <at> lwn.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Tue, 04 Mar 2025 17:06:56 -0700

Emacs trunk will often create new frames with strange (as in 8 line, 20
column) sizes when running in a pgtk build under wayland.  Reproduce
with:

  $ emacs -q
  C-x 5 b <ret>

The first time usually produces a normal frame; subsequent times often
will not.

NOTE that I first mentioned this in the discussion of bug#76481, but
this is a different and independent bug.  I spent a while bisecting it,
and landed on commit 24161683 ("Remedy bug#63395"), which indeed looks
like a likely culprit.  A trunk build with that commit reverted does not
exhibit the buggy behavior.



In GNU Emacs 31.0.50 (build 25, x86_64-pc-linux-gnu, GTK+ Version
 3.24.43, cairo version 1.18.2) of 2025-03-04 built on trenco
Repository revision: e978737f57ef8447bba5796dd945ac185fcadffa
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12401005
System Description: Fedora Linux 41 (Workstation Edition)

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINERAMA XINPUT2 XPM
XRANDR GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
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  line-number-mode: t
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  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr compile comint ansi-osc ansi-color ring comp-run
bytecomp byte-compile comp-common rx emacsbug lisp-mnt message mailcap
yank-media puny dired dired-loaddefs rfc822 mml mml-sec password-cache
epa derived epg rfc6068 epg-config gnus-util text-property-search
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simple cl-generic indonesian philippine cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
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text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting cairo
gtk x-toolkit xinput2 x multi-tty move-toolbar make-network-process
tty-child-frames native-compile emacs)

Memory information:
((conses 16 69946 11825) (symbols 48 6822 0) (strings 32 17657 2214)
 (string-bytes 1 559976) (vectors 16 10720)
 (vector-slots 8 149911 8541) (floats 8 22 7) (intervals 56 380 14)
 (buffers 992 12))

Message #8 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jonathan Corbet <corbet <at> lwn.net>, Po Lu <luangruo <at> yahoo.com>
Cc: 76751 <at> debbugs.gnu.org
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Wed, 05 Mar 2025 15:10:02 +0200

> From: Jonathan Corbet <corbet <at> lwn.net>
> Date: Tue, 04 Mar 2025 17:06:56 -0700
> 
> 
> Emacs trunk will often create new frames with strange (as in 8 line, 20
> column) sizes when running in a pgtk build under wayland.  Reproduce
> with:
> 
>   $ emacs -q
>   C-x 5 b <ret>
> 
> The first time usually produces a normal frame; subsequent times often
> will not.
> 
> NOTE that I first mentioned this in the discussion of bug#76481, but
> this is a different and independent bug.  I spent a while bisecting it,
> and landed on commit 24161683 ("Remedy bug#63395"), which indeed looks
> like a likely culprit.  A trunk build with that commit reverted does not
> exhibit the buggy behavior.

Po Lu, could you please take a look?

Message #11 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: luangruo <at> yahoo.com
Cc: 76751 <at> debbugs.gnu.org, corbet <at> lwn.net
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Sat, 15 Mar 2025 13:20:44 +0200

> Cc: 76751 <at> debbugs.gnu.org
> Date: Wed, 05 Mar 2025 15:10:02 +0200
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> > From: Jonathan Corbet <corbet <at> lwn.net>
> > Date: Tue, 04 Mar 2025 17:06:56 -0700
> > 
> > 
> > Emacs trunk will often create new frames with strange (as in 8 line, 20
> > column) sizes when running in a pgtk build under wayland.  Reproduce
> > with:
> > 
> >   $ emacs -q
> >   C-x 5 b <ret>
> > 
> > The first time usually produces a normal frame; subsequent times often
> > will not.
> > 
> > NOTE that I first mentioned this in the discussion of bug#76481, but
> > this is a different and independent bug.  I spent a while bisecting it,
> > and landed on commit 24161683 ("Remedy bug#63395"), which indeed looks
> > like a likely culprit.  A trunk build with that commit reverted does not
> > exhibit the buggy behavior.
> 
> Po Lu, could you please take a look?

Ping!

Message #14 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 76751 <at> debbugs.gnu.org, corbet <at> lwn.net
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Sun, 16 Mar 2025 09:16:51 +0800

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

>> Cc: 76751 <at> debbugs.gnu.org
>> Date: Wed, 05 Mar 2025 15:10:02 +0200
>> From: Eli Zaretskii <eliz <at> gnu.org>
>> 
>> > From: Jonathan Corbet <corbet <at> lwn.net>
>> > Date: Tue, 04 Mar 2025 17:06:56 -0700
>> > 
>> > 
>> > Emacs trunk will often create new frames with strange (as in 8 line, 20
>> > column) sizes when running in a pgtk build under wayland.  Reproduce
>> > with:
>> > 
>> >   $ emacs -q
>> >   C-x 5 b <ret>
>> > 
>> > The first time usually produces a normal frame; subsequent times often
>> > will not.
>> > 
>> > NOTE that I first mentioned this in the discussion of bug#76481, but
>> > this is a different and independent bug.  I spent a while bisecting it,
>> > and landed on commit 24161683 ("Remedy bug#63395"), which indeed looks
>> > like a likely culprit.  A trunk build with that commit reverted does not
>> > exhibit the buggy behavior.
>> 
>> Po Lu, could you please take a look?
>
> Ping!

I'll investigate everything next weekend.

Message #17 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: 76751 <at> debbugs.gnu.org, corbet <at> lwn.net
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Sat, 29 Mar 2025 14:24:26 +0300

> From: Po Lu <luangruo <at> yahoo.com>
> Cc: corbet <at> lwn.net,  76751 <at> debbugs.gnu.org
> Date: Sun, 16 Mar 2025 09:16:51 +0800
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> Cc: 76751 <at> debbugs.gnu.org
> >> Date: Wed, 05 Mar 2025 15:10:02 +0200
> >> From: Eli Zaretskii <eliz <at> gnu.org>
> >> 
> >> > From: Jonathan Corbet <corbet <at> lwn.net>
> >> > Date: Tue, 04 Mar 2025 17:06:56 -0700
> >> > 
> >> > 
> >> > Emacs trunk will often create new frames with strange (as in 8 line, 20
> >> > column) sizes when running in a pgtk build under wayland.  Reproduce
> >> > with:
> >> > 
> >> >   $ emacs -q
> >> >   C-x 5 b <ret>
> >> > 
> >> > The first time usually produces a normal frame; subsequent times often
> >> > will not.
> >> > 
> >> > NOTE that I first mentioned this in the discussion of bug#76481, but
> >> > this is a different and independent bug.  I spent a while bisecting it,
> >> > and landed on commit 24161683 ("Remedy bug#63395"), which indeed looks
> >> > like a likely culprit.  A trunk build with that commit reverted does not
> >> > exhibit the buggy behavior.
> >> 
> >> Po Lu, could you please take a look?
> >
> > Ping!
> 
> I'll investigate everything next weekend.

Did you have a chance to look into this?

Message #20 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 76751 <at> debbugs.gnu.org, corbet <at> lwn.net
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Sat, 29 Mar 2025 21:08:59 +0800

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

> Did you have a chance to look into this?

Yes, but I was stymied by the fact that the PGTK port delegates scaling
to GTK, and so `xg_get_scale' always returns 1, on which account the
commit Johnathan identified should not have affected any behavior, on
such configurations, that is.

Message #23 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: 76751 <at> debbugs.gnu.org, corbet <at> lwn.net
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Sat, 05 Apr 2025 12:06:10 +0300

> From: Po Lu <luangruo <at> yahoo.com>
> Cc: 76751 <at> debbugs.gnu.org,  corbet <at> lwn.net
> Date: Sat, 29 Mar 2025 21:08:59 +0800
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > Did you have a chance to look into this?
> 
> Yes, but I was stymied by the fact that the PGTK port delegates scaling
> to GTK, and so `xg_get_scale' always returns 1, on which account the
> commit Johnathan identified should not have affected any behavior, on
> such configurations, that is.

So what should we do to make some progress here?

Or is this problem not solvable in Emacs?

Message #26 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Jonathan Corbet <corbet <at> lwn.net>
To: Eli Zaretskii <eliz <at> gnu.org>, Po Lu <luangruo <at> yahoo.com>
Cc: 76751 <at> debbugs.gnu.org
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Fri, 11 Apr 2025 08:08:16 -0600

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

>> From: Po Lu <luangruo <at> yahoo.com>
>> Cc: 76751 <at> debbugs.gnu.org,  corbet <at> lwn.net
>> Date: Sat, 29 Mar 2025 21:08:59 +0800
>> 
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>> 
>> > Did you have a chance to look into this?
>> 
>> Yes, but I was stymied by the fact that the PGTK port delegates scaling
>> to GTK, and so `xg_get_scale' always returns 1, on which account the
>> commit Johnathan identified should not have affected any behavior, on
>> such configurations, that is.
>
> So what should we do to make some progress here?
>
> Or is this problem not solvable in Emacs?

Reverting the commit definitely fixed things here.  I wish I understood
more about how this stuff works to try to track things down, but I'm a
dumb kernel guy...  I guess I should go look at the problem that fix was
originally put in to solve, maybe there's a clue there.

I take it nobody else has complained?

Thanks,

jon

Message #29 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: luangruo <at> yahoo.com, Jonathan Corbet <corbet <at> lwn.net>
Cc: 76751 <at> debbugs.gnu.org
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Sat, 26 Apr 2025 14:26:32 +0300

Ping!  Any ideas for how to make progress with this issue?

> From: Jonathan Corbet <corbet <at> lwn.net>
> Cc: 76751 <at> debbugs.gnu.org
> Date: Fri, 11 Apr 2025 08:08:16 -0600
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> From: Po Lu <luangruo <at> yahoo.com>
> >> Cc: 76751 <at> debbugs.gnu.org,  corbet <at> lwn.net
> >> Date: Sat, 29 Mar 2025 21:08:59 +0800
> >> 
> >> Eli Zaretskii <eliz <at> gnu.org> writes:
> >> 
> >> > Did you have a chance to look into this?
> >> 
> >> Yes, but I was stymied by the fact that the PGTK port delegates scaling
> >> to GTK, and so `xg_get_scale' always returns 1, on which account the
> >> commit Johnathan identified should not have affected any behavior, on
> >> such configurations, that is.
> >
> > So what should we do to make some progress here?
> >
> > Or is this problem not solvable in Emacs?
> 
> Reverting the commit definitely fixed things here.  I wish I understood
> more about how this stuff works to try to track things down, but I'm a
> dumb kernel guy...  I guess I should go look at the problem that fix was
> originally put in to solve, maybe there's a clue there.
> 
> I take it nobody else has complained?
> 
> Thanks,
> 
> jon
> 

Message #32 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: luangruo <at> yahoo.com, corbet <at> lwn.net
Cc: 76751 <at> debbugs.gnu.org
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Sat, 10 May 2025 12:28:40 +0300

Ping! Ping!  Po Lu and Jonathan, please respond, so we could make
further progress with this issue.

> Cc: 76751 <at> debbugs.gnu.org
> Date: Sat, 26 Apr 2025 14:26:32 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> Ping!  Any ideas for how to make progress with this issue?
> 
> > From: Jonathan Corbet <corbet <at> lwn.net>
> > Cc: 76751 <at> debbugs.gnu.org
> > Date: Fri, 11 Apr 2025 08:08:16 -0600
> > 
> > Eli Zaretskii <eliz <at> gnu.org> writes:
> > 
> > >> From: Po Lu <luangruo <at> yahoo.com>
> > >> Cc: 76751 <at> debbugs.gnu.org,  corbet <at> lwn.net
> > >> Date: Sat, 29 Mar 2025 21:08:59 +0800
> > >> 
> > >> Eli Zaretskii <eliz <at> gnu.org> writes:
> > >> 
> > >> > Did you have a chance to look into this?
> > >> 
> > >> Yes, but I was stymied by the fact that the PGTK port delegates scaling
> > >> to GTK, and so `xg_get_scale' always returns 1, on which account the
> > >> commit Johnathan identified should not have affected any behavior, on
> > >> such configurations, that is.
> > >
> > > So what should we do to make some progress here?
> > >
> > > Or is this problem not solvable in Emacs?
> > 
> > Reverting the commit definitely fixed things here.  I wish I understood
> > more about how this stuff works to try to track things down, but I'm a
> > dumb kernel guy...  I guess I should go look at the problem that fix was
> > originally put in to solve, maybe there's a clue there.
> > 
> > I take it nobody else has complained?
> > 
> > Thanks,
> > 
> > jon
> > 
> 
> 
> 
> 

Message #35 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Jonathan Corbet <corbet <at> lwn.net>
To: Eli Zaretskii <eliz <at> gnu.org>, luangruo <at> yahoo.com
Cc: 76751 <at> debbugs.gnu.org
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Sun, 11 May 2025 11:24:13 -0600

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

> Ping! Ping!  Po Lu and Jonathan, please respond, so we could make
> further progress with this issue.

Sorry, I'm far from home and only able to do so much.

If it were up to me, I would just revert the patch that caused the
problem, but I'm also aware it must have been written to solve some
other problem I haven't experienced...I wish I could be more help.

jon

Message #38 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: luangruo <at> yahoo.com
Cc: 76751 <at> debbugs.gnu.org, Jonathan Corbet <corbet <at> lwn.net>
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Sat, 24 May 2025 11:59:48 +0300

Po Lu, any suggestions about this?

> From: Jonathan Corbet <corbet <at> lwn.net>
> Cc: 76751 <at> debbugs.gnu.org
> Date: Sun, 11 May 2025 11:24:13 -0600
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > Ping! Ping!  Po Lu and Jonathan, please respond, so we could make
> > further progress with this issue.
> 
> Sorry, I'm far from home and only able to do so much.
> 
> If it were up to me, I would just revert the patch that caused the
> problem, but I'm also aware it must have been written to solve some
> other problem I haven't experienced...I wish I could be more help.
> 
> jon
> 

Message #41 received at 76751 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: luangruo <at> yahoo.com
Cc: 76751 <at> debbugs.gnu.org, corbet <at> lwn.net
Subject: Re: bug#76751: 31.0.50; Bad window sizing with pgtk (bisected)
Date: Sat, 07 Jun 2025 11:20:01 +0300

Ping!  Po Lu, could you please respond?

> Cc: 76751 <at> debbugs.gnu.org, Jonathan Corbet <corbet <at> lwn.net>
> Date: Sat, 24 May 2025 11:59:48 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> Po Lu, any suggestions about this?
> 
> > From: Jonathan Corbet <corbet <at> lwn.net>
> > Cc: 76751 <at> debbugs.gnu.org
> > Date: Sun, 11 May 2025 11:24:13 -0600
> > 
> > Eli Zaretskii <eliz <at> gnu.org> writes:
> > 
> > > Ping! Ping!  Po Lu and Jonathan, please respond, so we could make
> > > further progress with this issue.
> > 
> > Sorry, I'm far from home and only able to do so much.
> > 
> > If it were up to me, I would just revert the patch that caused the
> > problem, but I'm also aware it must have been written to solve some
> > other problem I haven't experienced...I wish I could be more help.
> > 
> > jon
> > 
> 
> 
> 
> 

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