bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[N. Jackson]

Recipe:

    emacs -Q

Expected results:

- The Emacs frame has a vertical scroll bar displayed on the right with
  the right edge of the scroll bar at the right edge of the frame. That
  is, the right edge of the scroll bar is in the same pixel column as
  the right edge of the title bar and menu bar. [In other words the
  scroll bar and the title bar / menu bar intersect in the form an
  inverted L.]

Actual results:

- The Emacs frame has a vertical scroll bar displayed on the right, but
  the right edge of the scroll bar is "indented" from the right edge of
  the frame. That is, the right edge of the scroll bar is a few pixels
  to the left of (the pixel column of) the right edge of the title bar
  and menu bar. [In other words the scroll bar and the title bar / menu
  bar intersect in the form a T.]

Additional information:

- Other programs on my system display their scroll bar properly aligned.


===

In GNU Emacs 24.4.91.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.14.9)
 of 2015-03-10 on moondust
Windowing system distributor `Fedora Project', version 11.0.11603000
System Description:	Fedora release 21 (Twenty One)

Configured using:
 `configure --prefix=/home/nlj/local/ --enable-checking 'CFLAGS=-O0 -g3
 -ggdb''

Important settings:
  value of $LC_MONETARY: en_DK.utf8
  value of $LC_NUMERIC: en_DK.utf8
  value of $LC_TIME: en_DK.utf8
  value of $LANG: en_CA.utf8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Group

Minor modes in effect:
  gnus-undo-mode: t
  TeX-PDF-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  display-battery-mode: t
  display-time-mode: t
  delete-selection-mode: t
  savehist-mode: t
  iswitchb-mode: t
  desktop-save-mode: t
  cua-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
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent messages:
Auto-saving...done
End of buffer [3 times]
Auto-saving...done
Mark set
Checking new news...
Reading active file from archive via nnfolder...done
Checking new news...done
Quit
byte-code: End of buffer [2 times]
<mouse-6> is undefined [3 times]

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bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[martin rudalics]

 >      emacs -Q
 >
 > Expected results:
 >
 > - The Emacs frame has a vertical scroll bar displayed on the right with
 >    the right edge of the scroll bar at the right edge of the frame. That
 >    is, the right edge of the scroll bar is in the same pixel column as
 >    the right edge of the title bar and menu bar. [In other words the
 >    scroll bar and the title bar / menu bar intersect in the form an
 >    inverted L.]
 >
 > Actual results:
 >
 > - The Emacs frame has a vertical scroll bar displayed on the right, but
 >    the right edge of the scroll bar is "indented" from the right edge of
 >    the frame. That is, the right edge of the scroll bar is a few pixels
 >    to the left of (the pixel column of) the right edge of the title bar
 >    and menu bar. [In other words the scroll bar and the title bar / menu
 >    bar intersect in the form a T.]
 >
 > Additional information:
 >
 > - Other programs on my system display their scroll bar properly aligned.

I suppose its the hardcoded w = 16 in update_theme_scrollbar_width.

Does anything change if you play around with say

(set-frame-parameter nil 'scroll-bar-width 14)

or smaller values than 14?

martin

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[N. Jackson]

At 16:54 -0300 on Monday 2015-03-23, martin rudalics wrote:

>> - The Emacs frame has a vertical scroll bar displayed on the right, but
>>    the right edge of the scroll bar is "indented" from the right edge of
>>    the frame. That is, the right edge of the scroll bar is a few pixels
>>    to the left of (the pixel column of) the right edge of the title bar
>>    and menu bar. [In other words the scroll bar and the title bar / menu
>>    bar intersect in the form a T.]
>
> I suppose its the hardcoded w = 16 in update_theme_scrollbar_width.
>
> Does anything change if you play around with say
>
> (set-frame-parameter nil 'scroll-bar-width 14)
>
> or smaller values than 14?

Hi Martin,

Yes. Setting scroll-bar-width to 14 reduces the indent. At 13 and at 12
the indent is gone and the window (Emacs frame, that is) looks correct.
And at 11 and 10 and smaller I see the scrollbar being noticably clipped
(it is too far to the right and the right side of it is missing).

I'm guessing there must be a way to get the correct value from the
toolkit rather than hard coding it to 16?

Thanks.

Regards,
Neil.

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[martin rudalics]

 > I'm guessing there must be a way to get the correct value from the
 > toolkit rather than hard coding it to 16?

It's not hardcoded to 16, it's rounded up.  The respective code is

   gtk_widget_style_get (wscroll, "slider-width", &w, "trough-border", &b, NULL);
   ...
   w += 2*b;
   if (w < 16) w = 16;

so we do get it from the toolkit but we adjust it thereafter.  For the
height of the horizontal scroll bars I used

   gtk_widget_style_get (wscroll, "slider-width", &w, "trough-border", &b, NULL);
   ...
   w += 2*b;
   if (w < 12) w = 12;

and you should be able to verify that this doesn't cause the same
problem.  I asked Jan about this and he answered that 16 was used
because of problems with Gtk2 (IIRC).  Maybe he can tell more.

martin

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[Jan D.]

> 23 mar 2015 kl. 22:48 skrev martin rudalics <rudalics@gmx.at>:
> 
>  I asked Jan about this and he answered that 16 was used
> because of problems with Gtk2 (IIRC).  Maybe he can tell more.

16 was the hardcoded width for Gtk2.  You can #ifdef it.

	Jan D.

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[martin rudalics]

 > 16 was the hardcoded width for Gtk2.

Does that mean gtk_widget_style_get is broken for Gtk2?

 > You can #ifdef it.

Like

#if (! GTK_CHECK_VERSION (3, 0, 0)
   if (w < 16) w = 16;
#endif

?

martin

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[Jan D.]

> 24 mar 2015 kl. 11:51 skrev martin rudalics <rudalics@gmx.at>:
> 
> > 16 was the hardcoded width for Gtk2.
> 
> Does that mean gtk_widget_style_get is broken for Gtk2?

It means that the width it returns is 16.

> 
> > You can #ifdef it.
> 
> Like
> 
> #if (! GTK_CHECK_VERSION (3, 0, 0)
>  if (w < 16) w = 16;
> #endif
> 

Yes, or 
#ifndef HAVE_GTK3
...

	Jan D.

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[N. Jackson]

At 13:16 -0300 on Tuesday 2015-03-24, Jan D. wrote:

>> 24 mar 2015 kl. 11:51 skrev martin rudalics <rudalics@gmx.at>:
>> 
>> > 16 was the hardcoded width for Gtk2.
>> 
>> Does that mean gtk_widget_style_get is broken for Gtk2?
>
> It means that the width it returns is 16.
>
>> 
>> > You can #ifdef it.
>> 
>> Like
>> 
>> #if (! GTK_CHECK_VERSION (3, 0, 0)
>>  if (w < 16) w = 16;
>> #endif
>> 
>
> Yes, or 
> #ifndef HAVE_GTK3
> ...
>
> 	Jan D.

Of course, if gtk_widget_style_get() only returns 16 when the GDK
version is not GDK3, then this line

    if (w < 16) w = 16;

in update_theme_scrollbar_width() of gtkutil.c does nothing when the
GDK version is not GDK3.

Since we don't need this adjustment with GDK3 (with which
gtk_widget_style_get() returns the correct value from the toolkit), I
replaced the offending line with

    #ifndef HAVE_GTK3
        /*  if (w < 16) w = 16; */
        eassert (w == 16); 
    #endif 

and this seems to fix the bug for me. (Of course, removing the offending
line altogether has the same effect.)

I don't have a GTK2 system to test on, though.

Note: The badness is somehow encoded in my desktop file as well, so to
see that the fix was working I had to rename my desktop file or run with
emacs --no-desktop.

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[N. Jackson]

I forgot to copy Martin on the message below (didn't reply widely
enough I guess). Sorry.

Also, I need to amend one thing I wrote (see below).

At 17:39 -0300 on Tuesday 2015-03-24, N. Jackson wrote:

> At 13:16 -0300 on Tuesday 2015-03-24, Jan D. wrote:
>
>>> 24 mar 2015 kl. 11:51 skrev martin rudalics <rudalics@gmx.at>:
>>> 
>>> > 16 was the hardcoded width for Gtk2.
>>> 
>>> Does that mean gtk_widget_style_get is broken for Gtk2?
>>
>> It means that the width it returns is 16.
>>
>>> 
>>> > You can #ifdef it.
>>> 
>>> Like
>>> 
>>> #if (! GTK_CHECK_VERSION (3, 0, 0)
>>>  if (w < 16) w = 16;
>>> #endif
>>> 
>>
>> Yes, or 
>> #ifndef HAVE_GTK3
>> ...
>>
>> 	Jan D.
>
> Of course, if gtk_widget_style_get() only returns 16 when the GDK
> version is not GDK3, then this line
>
>     if (w < 16) w = 16;
>
> in update_theme_scrollbar_width() of gtkutil.c does nothing when the
> GDK version is not GDK3.
>
> Since we don't need this adjustment with GDK3 (with which
> gtk_widget_style_get() returns the correct value from the toolkit), I
> replaced the offending line with
>
>     #ifndef HAVE_GTK3
>         /*  if (w < 16) w = 16; */
>         eassert (w == 16); 
>     #endif 
>
> and this seems to fix the bug for me. (Of course, removing the offending
> line altogether has the same effect.)

It would need to be

        eassert (w >= 16); 
                   ^
because of the

    w += 2*b;

line. [In my opinion it is a terrible idea to have a variable change its
semantics like this in the middle of a function -- it invitably leads to
mistakes.]

> I don't have a GTK2 system to test on, though.
>
> Note: The badness is somehow encoded in my desktop file as well, so to
> see that the fix was working I had to rename my desktop file or run with
> emacs --no-desktop.

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[Jan D.]

Hi.

> 24 mar 2015 kl. 21:39 skrev N. Jackson <nljlistbox2@gmail.com>:
> 
> At 13:16 -0300 on Tuesday 2015-03-24, Jan D. wrote:
> 
>>>> 24 mar 2015 kl. 11:51 skrev martin rudalics <rudalics@gmx.at>:
>>>> 
>>>> 16 was the hardcoded width for Gtk2.
>>> 
>>> Does that mean gtk_widget_style_get is broken for Gtk2?
>> 
>> It means that the width it returns is 16.
>> 
>>> 
>>>> You can #ifdef it.
>>> 
>>> Like
>>> 
>>> #if (! GTK_CHECK_VERSION (3, 0, 0)
>>> if (w < 16) w = 16;
>>> #endif
>>> 
>> 
>> Yes, or 
>> #ifndef HAVE_GTK3
>> ...
>> 
>>    Jan D.
> 
> Of course, if gtk_widget_style_get() only returns 16 when the GDK
> version is not GDK3, then this line
> 
>    if (w < 16) w = 16;
> 
> in update_theme_scrollbar_width() of gtkutil.c does nothing when the
> GDK version is not GDK3.
> 
> Since we don't need this adjustment with GDK3 (with which
> gtk_widget_style_get() returns the correct value from the toolkit), I
> replaced the offending line with
> 
>    #ifndef HAVE_GTK3
>        /*  if (w < 16) w = 16; */
>        eassert (w == 16); 
>    #endif 
> 
> and this seems to fix the bug for me. (Of course, removing the offending
> line altogether has the same effect.)

You have added an assert that is dependent on how non-Emacs code behaves. That is wrong in all possible ways.

> 
> I don't have a GTK2 system to test on, though.

If you are adding asserts, you should be sure that all Gtk+ 2 versions behaves like this, which includes all patched versions that are used by distributions. 

       Jan D. 
> 
> Note: The badness is somehow encoded in my desktop file as well, so to
> see that the fix was working I had to rename my desktop file or run with
> emacs --no-desktop.
> 

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[N. Jackson]

At 18:38 -0300 on Tuesday 2015-03-24, Jan D. wrote:

> You have added an assert that is dependent on how non-Emacs code
> behaves. That is wrong in all possible ways.

Sorry for the confusion. I am adding nothing. I was just reporting the
code I tested with. [When I'm debugging I like things to fail
immediately if the code is making an invalid assumption, rather than
waiting for confusing behaviour later on. Hence the assert.]

> If you are adding asserts, you should be sure that all Gtk+ 2 versions
> behaves like this, which includes all patched versions that are used
> by distributions.

I was working from your earlier statement, when you apparently said that
a slider-width of 16 is always returned by gtk_widget_style_get() when
the GDK version is not GDK3. Clearly that was a misunderstanding of what
you wrote. At least we have now clarified that we are uncertain about
this.

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[Jan D.]

Hi.

> 25 mar 2015 kl. 00:20 skrev N. Jackson <nljlistbox2@gmail.com>:
> 
> At 18:38 -0300 on Tuesday 2015-03-24, Jan D. wrote:
> 
>> You have added an assert that is dependent on how non-Emacs code
>> behaves. That is wrong in all possible ways.
> 
> Sorry for the confusion. I am adding nothing. I was just reporting the
> code I tested with. [When I'm debugging I like things to fail
> immediately if the code is making an invalid assumption, rather than
> waiting for confusing behaviour later on. Hence the assert.]
> 
>> If you are adding asserts, you should be sure that all Gtk+ 2 versions
>> behaves like this, which includes all patched versions that are used
>> by distributions.
> 
> I was working from your earlier statement, when you apparently said that
> a slider-width of 16 is always returned by gtk_widget_style_get() when
> the GDK version is not GDK3. Clearly that was a misunderstanding of what
> you wrote. At least we have now clarified that we are uncertain about
> this.

The 16 is returned by default.  A theme may have different values, but the width is rendered as 16 anyway, basically disregarding theme values.  Gtk2 themes generally have 16 width scrollbars, but there might be exceptions.
Sorry if that was unclear.

	Jan D.

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[martin rudalics]

 > Yes, or
 > #ifndef HAVE_GTK3
 > ...

Couldn't resist making this change on the release branch.  It seems to
resolve a number of additional issues like the one I mentioned here:

http://lists.gnu.org/archive/html/emacs-devel/2014-01/msg02228.html

Thanks for the advice, martin

bug#20182: 24.4.91; [GTK3] Vertical scroll bar is "indented" from right edge of frame

[martin rudalics]

Version: 24.5

> Couldn't resist making this change on the release branch.  It seems to
> resolve a number of additional issues like the one I mentioned here:
>
> http://lists.gnu.org/archive/html/emacs-devel/2014-01/msg02228.html

Bug closed.

martin