GNU bug report logs - #20527
24.5; [w32] resizing window from bottom-left/top-right corner causes broken resizing

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

From: Vladimir Vukicevic <vladimir <at> pobox.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5; [w32] resizing window from bottom-left/top-right corner causes
 broken resizing
Date: Thu, 7 May 2015 09:10:31 -0400

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

Trying to resize the Emacs window on win32 using the bottom-left or
top-right corner causes broken resizing to happen, as described below.
This has happened in a number of previous versions of emacs as well,
from at least 24.3, and possibly earlier.  Verified using -Q as well.

From the bottom-left:
- If the mouse is moved left/right, the window will resize horizontally
  mostly properly, but will start shrinking vertically from the top
- If the mouse is moved up, the bottom of the window will resize
  properly, but the window will rapidly shrink from the top
- If the mouse is moved down, the window tends to just be moved along
  with the mouse, not resized.

Similarly from the top-right.  Resizing using the top-left and bottom-right
window corners works properly.  It almost looks like some calculation
for the new window size (in lines) is rounding in the wrong direction,
so the window keeps constantly shrinking.  Toggling menubar or toolbar
on or off doesn't make a difference in behaviour.

The monitor is set to 100% size, no high dpi Windows goop is in play.
Windows 8.1, but observed previously on Windows 7 and Windows 8.

In GNU Emacs 24.5.1 (x86_64-w64-mingw32)
 of 2015-04-12 on KAEL
Windowing system distributor `Microsoft Corp.', version 6.3.9600
Configured using:
 `configure --prefix=/z/emacs --host=x86_64-w64-mingw32
 --target=x86_64-w64-mingw32 --build=x86_64-w64-mingw32 --with-wide-int
 --with-jpeg --with-xpm --with-png --with-tiff --with-rsvg --with-xml2
 --with-gnutls --with-sound=yes --with-file-notification=yes
 --without-dbus --without-imagemagick 'CFLAGS=-Ofast
 -fomit-frame-pointer -funroll-loops -g0 -pipe' 'LDFLAGS=-static-libgcc
 -static-libstdc++ -static -s -Wl,-s''

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252

Major mode: C/l

Minor modes in effect:
  diff-auto-refine-mode: t
  desktop-save-mode: t
  iswitchb-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

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[Message part 2 (text/html, inline)]

Message #8 received at 20527 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Vladimir Vukicevic <vladimir <at> pobox.com>
Cc: 20527 <at> debbugs.gnu.org
Subject: Re: bug#20527: 24.5;
 [w32] resizing window from bottom-left/top-right corner causes
 broken	resizing
Date: Thu, 07 May 2015 20:57:05 +0300

> Date: Thu, 7 May 2015 09:10:31 -0400
> From: Vladimir Vukicevic <vladimir <at> pobox.com>
> 
> Trying to resize the Emacs window on win32 using the bottom-left or
> top-right corner causes broken resizing to happen, as described below.
> This has happened in a number of previous versions of emacs as well,
> from at least 24.3, and possibly earlier. Verified using -Q as well.
> 
> From the bottom-left:
> - If the mouse is moved left/right, the window will resize horizontally
> mostly properly, but will start shrinking vertically from the top
> - If the mouse is moved up, the bottom of the window will resize
> properly, but the window will rapidly shrink from the top
> - If the mouse is moved down, the window tends to just be moved along
> with the mouse, not resized.
> 
> Similarly from the top-right. Resizing using the top-left and bottom-right
> window corners works properly. It almost looks like some calculation
> for the new window size (in lines) is rounding in the wrong direction,
> so the window keeps constantly shrinking. Toggling menubar or toolbar
> on or off doesn't make a difference in behaviour.

Either I don't understand your description, or I cannot reproduce what
you describe.  All I see here is expected: Emacs just tries to keep
the frame and the windows at integral multiple of character size.  I
see no other unwarranted resizing.

If that's what you see, you may wish to try setting
frame-resize-pixelwise and maybe also window-resize-pixelwise to
non-nil values, perhaps you will like the results better.

If you see something else, try to describe it in more details, or
perhaps post a screencast.

Message #11 received at 20527 <at> debbugs.gnu.org (full text, mbox):

From: Vladimir Vukicevic <vladimir <at> pobox.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 20527 <at> debbugs.gnu.org
Subject: Re: bug#20527: 24.5; [w32] resizing window from bottom-left/top-right
 corner causes broken resizing
Date: Thu, 7 May 2015 14:05:36 -0400

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

On Thu, May 7, 2015 at 1:57 PM, Eli Zaretskii <eliz <at> gnu.org> wrote:

> > Date: Thu, 7 May 2015 09:10:31 -0400
> > From: Vladimir Vukicevic <vladimir <at> pobox.com>
> >
> > Trying to resize the Emacs window on win32 using the bottom-left or
> > top-right corner causes broken resizing to happen, as described below.
> > This has happened in a number of previous versions of emacs as well,
> > from at least 24.3, and possibly earlier. Verified using -Q as well.
> >
> > From the bottom-left:
> > - If the mouse is moved left/right, the window will resize horizontally
> > mostly properly, but will start shrinking vertically from the top
> > - If the mouse is moved up, the bottom of the window will resize
> > properly, but the window will rapidly shrink from the top
> > - If the mouse is moved down, the window tends to just be moved along
> > with the mouse, not resized.
> >
> > Similarly from the top-right. Resizing using the top-left and
> bottom-right
> > window corners works properly. It almost looks like some calculation
> > for the new window size (in lines) is rounding in the wrong direction,
> > so the window keeps constantly shrinking. Toggling menubar or toolbar
> > on or off doesn't make a difference in behaviour.
>
> Either I don't understand your description, or I cannot reproduce what
> you describe.  All I see here is expected: Emacs just tries to keep
> the frame and the windows at integral multiple of character size.  I
> see no other unwarranted resizing.
>
> If that's what you see, you may wish to try setting
> frame-resize-pixelwise and maybe also window-resize-pixelwise to
> non-nil values, perhaps you will like the results better.
>
> If you see something else, try to describe it in more details, or
> perhaps post a screencast.
>

Hmm.. interesting. I just put a screencast up on
http://screencast.com/t/7tYMRdYpo1RA

Setting frame-resize-pixelwise to non-nil fixes the problem though!  So it
still feels like an issue due to the rounding.

    - Vlad

[Message part 2 (text/html, inline)]

Message #14 received at 20527 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Vladimir Vukicevic <vladimir <at> pobox.com>
Cc: 20527 <at> debbugs.gnu.org
Subject: Re: bug#20527: 24.5;
 [w32] resizing window from bottom-left/top-right corner causes broken
 resizing
Date: Thu, 07 May 2015 21:40:11 +0300

> Date: Thu, 7 May 2015 14:05:36 -0400
> From: Vladimir Vukicevic <vladimir <at> pobox.com>
> Cc: 20527 <at> debbugs.gnu.org
> 
> Hmm.. interesting. I just put a screencast up on
> http://screencast.com/t/7tYMRdYpo1RA

I certainly see nothing like that here.

> Setting frame-resize-pixelwise to non-nil fixes the problem though! So it still
> feels like an issue due to the rounding.

Yes, but some other factor must be at work here, because I don't see
it even without those customizations.  Perhaps you've changed some
Windows settings that cause this, I don't know.

Message #17 received at 20527 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Vladimir Vukicevic <vladimir <at> pobox.com>, Eli Zaretskii <eliz <at> gnu.org>
Cc: 20527 <at> debbugs.gnu.org
Subject: Re: bug#20527: 24.5; [w32] resizing window from bottom-left/top-right
 corner causes broken resizing
Date: Sun, 10 May 2015 14:30:52 +0200

> Hmm.. interesting. I just put a screencast up on
> http://screencast.com/t/7tYMRdYpo1RA

To watch this with Firefox I'm asked to install a thing called Adobe
Flash Player which I refuse because in the past it silently tried to
install other software as well.

So could you please try to break the stream into some significant
screenshots and post them here.

Thanks in advance, martin

Message #20 received at 20527 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: martin rudalics <rudalics <at> gmx.at>
Cc: vladimir <at> pobox.com, 20527 <at> debbugs.gnu.org
Subject: Re: bug#20527: 24.5;
 [w32] resizing window from bottom-left/top-right corner causes broken
 resizing
Date: Sun, 10 May 2015 17:45:16 +0300

> Date: Sun, 10 May 2015 14:30:52 +0200
> From: martin rudalics <rudalics <at> gmx.at>
> CC: 20527 <at> debbugs.gnu.org
> 
>  > Hmm.. interesting. I just put a screencast up on
>  > http://screencast.com/t/7tYMRdYpo1RA
> 
> To watch this with Firefox I'm asked to install a thing called Adobe
> Flash Player which I refuse because in the past it silently tried to
> install other software as well.
> 
> So could you please try to break the stream into some significant
> screenshots and post them here.

What the screencast shows is that when you move the lower-left edge of
the frame, the upper-right edge moves as well, as if each character of
change in the size caused by your dragging gets _another_ character of
change that causes the other side to move.

Message #23 received at 20527 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: vladimir <at> pobox.com, 20527 <at> debbugs.gnu.org
Subject: Re: bug#20527: 24.5; [w32] resizing window from bottom-left/top-right
 corner causes broken resizing
Date: Mon, 11 May 2015 12:08:53 +0200

> What the screencast shows is that when you move the lower-left edge of
> the frame, the upper-right edge moves as well, as if each character of
> change in the size caused by your dragging gets _another_ character of
> change that causes the other side to move.

Strange indeed.  I never trusted the code in WM_WINDOWPOSCHANGING.

martin

Message #28 received at 20527-done <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Vladimir Vukicevic <vladimir <at> pobox.com>, Eli Zaretskii <eliz <at> gnu.org>
Cc: 20527-done <at> debbugs.gnu.org
Subject: Re: bug#20527: 24.5; [w32] resizing window from bottom-left/top-right
 corner causes broken resizing
Date: Wed, 20 May 2015 11:48:33 +0200

> Setting frame-resize-pixelwise to non-nil fixes the problem though!

This will probably be the only way to handle this for Emacs 24.5.

Closing this bug because with Emacs 25.1 mouse resizing the frame is
always done pixelwise on Windows.

martin

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