GNU bug report logs - #16474
24.3.50; `set-window-scroll-bars` has no effect after you set it once to zero

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

From: Drew Adams <drew.adams <at> oracle.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; `set-window-scroll-bars` has no effect after you set it once
 to zero
Date: Thu, 16 Jan 2014 20:03:45 -0800 (PST)

emacs -Q

M-: (set-window-scroll-bars nil 0)

The scroll bar disappears.

M-: (window-scroll-bars) 

returns (0 0 nil nil)

M-: (set-window-scroll-bars nil 20)

has no visible effect.

M-: (window-scroll-bars) 

still returns (0 0 nil nil)

Toggling `scroll-bar-mode' any number of times also has no effect.

While I'm at it: a doc bug for `window-scroll-bars': There is no
description of any of these terms that are introduced, hence there
is no real description of the return-value: zero information, other
than it being a list of 4 elements):

WIDTH
COLS
VERTICAL-TYPE
HORIZONTAL-TYPE

For a function that *gets* some information, this doc string tells you
almost nothing about what that information is.


In GNU Emacs 24.3.50.1 (i686-pc-mingw32)
 of 2014-01-07 on ODIEONE
Bzr revision: 115916 bzg <at> gnu.org-20140107233629-du2solx6tmxnx0np
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --prefix=/c/Devel/emacs/binary --enable-checking=yes,glyphs
 'CFLAGS=-O0 -g3' LDFLAGS=-Lc:/Devel/emacs/lib
 CPPFLAGS=-Ic:/Devel/emacs/include'

Message #8 received at 16474 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: 16474 <at> debbugs.gnu.org
Subject: Re: bug#16474: 24.3.50; `set-window-scroll-bars` has no effect after
 you set it once to zero
Date: Fri, 17 Jan 2014 08:20:06 +0100

> M-: (set-window-scroll-bars nil 0)
>
> The scroll bar disappears.
>
> M-: (window-scroll-bars)
>
> returns (0 0 nil nil)
>
> M-: (set-window-scroll-bars nil 20)
>
> has no visible effect.

Obviously so:

Third parameter VERTICAL-TYPE specifies the type of the vertical scroll
bar: left, right, or nil.

You specified nil.

martin

Message #11 received at 16474 <at> debbugs.gnu.org (full text, mbox):

From: Drew Adams <drew.adams <at> oracle.com>
To: martin rudalics <rudalics <at> gmx.at>
Cc: 16474 <at> debbugs.gnu.org
Subject: RE: bug#16474: 24.3.50; `set-window-scroll-bars` has no effect after
 you set it once to zero
Date: Fri, 17 Jan 2014 07:35:21 -0800 (PST)

>  > M-: (set-window-scroll-bars nil 0)
>  > The scroll bar disappears.
>  > M-: (window-scroll-bars)
>  > returns (0 0 nil nil)
>  > M-: (set-window-scroll-bars nil 20)
>  > has no visible effect.
> 
> Third parameter VERTICAL-TYPE specifies the type of the vertical scroll
> bar: left, right, or nil.  You specified nil.

Oops.  Thx.  I will close the bug.

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