bug#16284: 24.3.50; blank column shown with scroll bar configuration changes

bug#16284: 24.3.50; blank column shown with scroll bar configuration changes

[YAMAMOTO Mitsuharu]

Steps to reproduce:

1. $ emacs -Q -D &
2. M-x scroll-bar-mode RET
3. M-x scroll-bar-mode RET

Then you'll see a blank column to the right of the scroll bar.

				     YAMAMOTO Mitsuharu
				mituharu@math.s.chiba-u.ac.jp

In GNU Emacs 24.3.50.1 (i386-apple-darwin13.0.0, GTK+ Version 3.10.6)
 of 2013-12-29 on YAMAMOTO-no-MacBook-Air.local
Bzr revision: 115801 eggert@cs.ucla.edu-20131229071501-6o7tmxvr1z8q8mib
Windowing system distributor `The X.Org Foundation', version 11.0.11404000
Configured using:
 `configure --without-imagemagick LDFLAGS=-L/opt/local/lib
 CPPFLAGS=-I/opt/local/include'

bug#16284: 24.3.50; blank column shown with scroll bar configuration changes

[martin rudalics]

 > 1. $ emacs -Q -D &

Is "-D &" necessary?

 > 2. M-x scroll-bar-mode RET
 > 3. M-x scroll-bar-mode RET
 >
 > Then you'll see a blank column to the right of the scroll bar.

Does the frame shrink after step 2 and expand after step 3?  Does the
blank column appear below the tool-/menubar or at the right of its end?

I suppose everything happens within ns_set_vertical_scroll_bar.  So to
investigate this further, could you please step through this function in
order to find out what's different between when Emacs displays the
scrollbar for the first time and when it executes step 3.  In particular
the respective values of `left' after

   left = WINDOW_SCROLL_BAR_AREA_X (window);

would be interesting.

martin

bug#16284: 24.3.50; blank column shown with scroll bar configuration changes

[Eli Zaretskii]

> Date: Sun, 29 Dec 2013 16:49:36 +0900
> From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
> 
> Steps to reproduce:
> 
> 1. $ emacs -Q -D &
> 2. M-x scroll-bar-mode RET
> 3. M-x scroll-bar-mode RET
> 
> Then you'll see a blank column to the right of the scroll bar.

On MS-Windows, step 1 produces a frame with no scroll bar, but Emacs
evidently thinks the scroll bar is still there, because step 2 says
"Scroll-Bar mode disabled".  Repeating step 2 after that, followed by
step 3 produces correct display.

bug#16284: 24.3.50; blank column shown with scroll bar configuration changes

[Jan Djärv]

Hello.

29 dec 2013 kl. 15:07 skrev martin rudalics <rudalics@gmx.at>:

> > 1. $ emacs -Q -D &
> 
> Is "-D &" necessary?
> 
> > 2. M-x scroll-bar-mode RET
> > 3. M-x scroll-bar-mode RET
> >
> > Then you'll see a blank column to the right of the scroll bar.
> 
> Does the frame shrink after step 2 and expand after step 3?  Does the
> blank column appear below the tool-/menubar or at the right of its end?
> 
> I suppose everything happens within ns_set_vertical_scroll_bar.

The original report said Gtk+ so I guess not...

	Jan D.

>  So to
> investigate this further, could you please step through this function in
> order to find out what's different between when Emacs displays the
> scrollbar for the first time and when it executes step 3.  In particular
> the respective values of `left' after
> 
>  left = WINDOW_SCROLL_BAR_AREA_X (window);
> 
> would be interesting.
> 
> martin
> 
> 

bug#16284: 24.3.50; blank column shown with scroll bar configuration changes

[Jan Djärv]

Hello.

29 dec 2013 kl. 08:49 skrev YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>:

> Steps to reproduce:
> 
> 1. $ emacs -Q -D &
> 2. M-x scroll-bar-mode RET
> 3. M-x scroll-bar-mode RET
> 
> Then you'll see a blank column to the right of the scroll bar.
> 

I think it is something wrong with -D.  Emacs starts with no scroll bars, but when you do the first M-x scroll-bar-mode, Emacs says "Scroll-Bar mode disabled".

Without -D this works fine.

It also works fine with NS or no toolkit.  Lucid gets the extra column on the right, but the scroll bar appears on the left.

	Jan D.

> 				     YAMAMOTO Mitsuharu
> 				mituharu@math.s.chiba-u.ac.jp
> 
> In GNU Emacs 24.3.50.1 (i386-apple-darwin13.0.0, GTK+ Version 3.10.6)
> of 2013-12-29 on YAMAMOTO-no-MacBook-Air.local
> Bzr revision: 115801 eggert@cs.ucla.edu-20131229071501-6o7tmxvr1z8q8mib
> Windowing system distributor `The X.Org Foundation', version 11.0.11404000
> Configured using:
> `configure --without-imagemagick LDFLAGS=-L/opt/local/lib
> CPPFLAGS=-I/opt/local/include'
> 
> 

bug#16284: 24.3.50; blank column shown with scroll bar configuration changes

[martin rudalics]

> Steps to reproduce:
> 
> 1. $ emacs -Q -D &
> 2. M-x scroll-bar-mode RET
> 3. M-x scroll-bar-mode RET
> 
> Then you'll see a blank column to the right of the scroll bar.

Hopefully fixed now.  Please try again.

Thanks, martin

bug#16284: 24.3.50; blank column shown with scroll bar configuration changes

[Eli Zaretskii]

> Date: Mon, 30 Dec 2013 10:15:15 +0100
> From: martin rudalics <rudalics@gmx.at>
> Cc: 16284@debbugs.gnu.org
> 
> > Steps to reproduce:
> > 
> > 1. $ emacs -Q -D &
> > 2. M-x scroll-bar-mode RET
> > 3. M-x scroll-bar-mode RET
> > 
> > Then you'll see a blank column to the right of the scroll bar.
> 
> Hopefully fixed now.  Please try again.

Emacs still thinks the scroll bars are displayed when it is started
with -D: step 2 says "Scroll-Bar mode disabled", although the scroll
bar was not shown before that.

bug#16284: 24.3.50; blank column shown with scroll bar configuration changes

[martin rudalics]

 >>> Steps to reproduce:
 >>>
 >>> 1. $ emacs -Q -D &
 >>> 2. M-x scroll-bar-mode RET
 >>> 3. M-x scroll-bar-mode RET
 >>>
 >>> Then you'll see a blank column to the right of the scroll bar.
 >> Hopefully fixed now.  Please try again.
 >
 > Emacs still thinks the scroll bars are displayed when it is started
 > with -D: step 2 says "Scroll-Bar mode disabled", although the scroll
 > bar was not shown before that.

That's a different issue.  I only fixed the blank column part (which I
couldn't even observe on Windows).

I don't know how -D is processed internally and what its semantics wrt
scrollbars should be.  What's probably needed is to either disable
scroll-bar-mode or reset the `vertical-scroll-bar' parameter of the
initial frame.

martin

bug#16284: 24.3.50; blank column shown with scroll bar configuration changes

[Eli Zaretskii]

> Date: Mon, 30 Dec 2013 19:13:21 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: mituharu@math.s.chiba-u.ac.jp, 16284@debbugs.gnu.org
> 
>  >>> Steps to reproduce:
>  >>>
>  >>> 1. $ emacs -Q -D &
>  >>> 2. M-x scroll-bar-mode RET
>  >>> 3. M-x scroll-bar-mode RET
>  >>>
>  >>> Then you'll see a blank column to the right of the scroll bar.
>  >> Hopefully fixed now.  Please try again.
>  >
>  > Emacs still thinks the scroll bars are displayed when it is started
>  > with -D: step 2 says "Scroll-Bar mode disabled", although the scroll
>  > bar was not shown before that.
> 
> That's a different issue.

Ah, OK, I thought it was related.

> I only fixed the blank column part (which I couldn't even observe on
> Windows).

Right, I don't see it as well.

Sorry for the noise, I saw Jan saying that -D behaves the same on GTK,
so I thought these are symptoms of the same problem.

bug#16284: 24.3.50; blank column shown with scroll bar configuration changes

[YAMAMOTO Mitsuharu]

>>>>> On Mon, 30 Dec 2013 10:15:15 +0100, martin rudalics <rudalics@gmx.at> said:

>> Steps to reproduce:
>> 
>> 1. $ emacs -Q -D &
>> 2. M-x scroll-bar-mode RET
>> 3. M-x scroll-bar-mode RET
>> 
>> Then you'll see a blank column to the right of the scroll bar.

> Hopefully fixed now.  Please try again.

Fixed for me.  Thanks.  It has also fixed another bug I was about to
report (The right part of (non-toolkit) toolbar is not drawn with
similar scroll bar configuration change even when we started without
-D).

Closing.

				     YAMAMOTO Mitsuharu
				mituharu@math.s.chiba-u.ac.jp