Subject: bug#8919: closed (Re: bug#8919: 24.0.50; Ever-changing frame size for GTK3 toolkit on a KDE4 desktop)

From: [email-masked] (GNU bug Tracking System)
Date: Sun, 26 Jun 2011 18:52:02 +0000

Your bug report

#8919: 24.0.50; Ever-changing frame size for GTK3 toolkit on a KDE4 desktop

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to [email-masked].

-- 
8919: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=8919
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Subject: Re: bug#8919: 24.0.50; Ever-changing frame size for GTK3 toolkit on a KDE4 desktop
From: Jan Djärv <[email-masked]>
To: Dirk Ullrich <[email-masked]>
Cc: [email-masked]
Date: Sun, 26 Jun 2011 20:51:13 +0200
List-Id: <debbugs-submit.debbugs.gnu.org>

Hello.

I've checked in a really ugly solution (overriding X11 functions).  This only 
applies to Gtk3.  Maybe we should do like Firefox and only use Gtk for the 
style specific drawing, thus bypassing all the strange behaviour.  No time for 
that before feature freeze, though.

	Jan D.

Jan Djärv skrev 2011-06-26 17.36:
>
>
> Jan Djärv skrev 2011-06-24 12.58:
>>
>>
>> Dirk Ullrich skrev 2011-06-24 11.47:
>>
>>> I must confess that this the first time that I suffer from this
>>> shrinking of Emacs on KDE. (I use the Emacs' development version built
>>> for the GTK2 toolkit right from the beginning.) Maybe that the bug
>>> occured for an Emacs revision I didn't build. And for GTK2 it even
>>> doesn't happen at all yet - at least for me.
>>>
>>> By the way - for curiousity I reverted to revision 104583 i.e. the
>>> last one for your last GTK3-related changes. For this revision the
>>> shrinking error does not occur.
>>
>> Hi.
>>
>> This is not surprising, it is a timing issue.
>>
>
> Actually its not a timing issue. KDE uses min_width/height to calculate
> geometry constraints, i.e. a window shall obey
>
> width = ((width - min_width)/width_inc) * width_inc + min_width
>
> Ditto for height. This is OK if min_width is a multiple of width_inc.
>
> That may be seen as a bug in it self as base_size is what should be used, and
> that is what Gtk3 (and 2) uses.
>
> But Gtk3 sets min size by itself now, ignoring any min size set by Emacs (a
> gigantic bug IMHO). But Gtk3 doesn't bother to adjust min width so it is a
> multiple of width_inc (ditto for height). This is another bug.
>
> And in the style that Gtk+/Gnome is developed in ("we know best"), Gtk+
> actually resizes the frame after the window manager has resized it (bug #3).
> That is so Gtk+ can force its "we know best" view of what the size the frame
> shall have according to Gtk+, never mind that Emacs, the window manager and
> the user has another view.
>
> So in my case we set width to 680 pixel. But KDE calculates with the formula
> above that the width should be 378 pixels so it, being the window manager,
> resizes the frame to that. Gtk3 then sees that the frame has been resized, and
> rather than just accepting the size like any well behaved toolkit should do,
> it resizes again, now to 672 (width_inc is 8 here). And KDE then resizes to
> 370. And Gtk+ to 664. And KDE to 662. And so on. With luck they find a common
> denominator, or otherwise the frame gets resized until it hits the min width.
>
> If you move/hide the scroll bar, or menu bar or tool bar, Gtk+ sets a new min
> width/height, and the dance is on again.
>
>
> This is so ugly, so maybe Emacs should remove Gtk3 support for this release?
>
> There doesn't seem to be any sane way around this, except rewriting Gtk3+
> widgets to not set any min size other that the one the application has set.
>
> Jan D.

Subject: 24.0.50; Ever-changing frame size for GTK3 toolkit on a KDE4 desktop
From: Dirk Ullrich <[email-masked]>
To: [email-masked]
Date: Wed, 22 Jun 2011 13:04:10 +0200
List-Id: <debbugs-submit.debbugs.gnu.org>

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Please check that the From: line gives an address where you can be reached.
Your report will be posted to the [email-masked] mailing list
and the gnu.emacs.bug news group, and at http://debbugs.gnu.org.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug.  If you can, give
a recipe starting from `emacs -Q':

1. Compile Emacs from Bzr repository with the GTK3 toolkit.
2. Start Emacs on a KDE4 desktop.
3. Starting to use Emacs dimish its frame size, and the frame size is
changing with nearly every command.

Remark: Using the GTK2 toolkit avoids this bug. Maybe it is caused by
the following change reported in `src/ChangeLog':
2011-06-14  Jan Djärv  <[email-masked]>

	* xfns.c (x_set_scroll_bar_default_width): Remove argument to
	xg_get_default_scrollbar_width.

	* gtkutil.c: Include emacsgtkfixed.h if HAVE_GTK3.
	(int_gtk_range_get_value): Move to the scroll bar part of the file.
	(style_changed_cb): Call update_theme_scrollbar_width and call
	x_set_scroll_bar_default_width and xg_frame_set_char_size for
	all frames (Bug#8505).
	(xg_create_frame_widgets): Call emacs_fixed_new if HAVE_GTK3 (Bug#8505).
	Call gtk_window_set_resizable if HAVE_GTK3.
	(x_wm_set_size_hint): Call emacs_fixed_set_min_size with min width
	and height if HAVE_GTK3 (Bug#8505).
	(scroll_bar_width_for_theme): New variable.
	(update_theme_scrollbar_width): New function.
	(xg_get_default_scrollbar_width): Move code to
	update_theme_scrollbar_width, just return scroll_bar_width_for_theme.
	(xg_initialize): Call update_theme_scrollbar_width.

	* gtkutil.h (xg_get_default_scrollbar_width): Remove argument.

	* emacsgtkfixed.c, emacsgtkfixed.h: New files.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/usr/share/emacs/24.0.50/etc/DEBUG.

In GNU Emacs 24.0.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.0.11)
 of 2011-06-22 on red
Windowing system distributor `The X.Org Foundation', version 11.0.11002000
configured using `configure  '--prefix=/usr' '--sysconfdir=/etc'
'--localstatedir=/var' '--libexecdir=/usr/lib'
'--mandir=/usr/share/man' '--without-sound' '--with-x-toolkit=gtk3'
'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe'
'LDFLAGS=-Wl,--hash-style=gnu -Wl,--as-needed''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: de_DE.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x r e p o r t <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
/usr/share/emacs/site-lisp/coq-db hides
/usr/share/emacs/site-lisp/ProofGeneral/coq/coq-db
/usr/share/emacs/site-lisp/coq-syntax hides
/usr/share/emacs/site-lisp/ProofGeneral/coq/coq-syntax
/usr/share/emacs/site-lisp/coq hides
/usr/share/emacs/site-lisp/ProofGeneral/coq/coq

Features:
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mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mailabbrev mail-utils gmm-utils mailheader emacsbug tooltip
ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd
fontset image fringe lisp-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
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simple abbrev minibuffer loaddefs button faces cus-face files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)