GNU bug report logs - #54237
Disabling `scroll-bar-mode' fails when setting `default-frame-alist'

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

From: Tor Kringeland <tor.a.s.kringeland <at> ntnu.no>
To: bug-gnu-emacs <at> gnu.org
Subject: Disabling `scroll-bar-mode' fails when setting `default-frame-alist'
Date: Thu, 03 Mar 2022 15:44:56 +0100

Running

  emacs -Q --daemon -l test.el

where the content of test.el is

  (scroll-bar-mode -1)
  (setq default-frame-alist '((cursor-color . "#007fff")))

fails to disable `scroll-bar-mode'.  When opening an Emacs client, I
have to toggle `scroll-bar-mode' two times to disable it.  The first
time it is "enabled" again (no visible change) and the second time it's
disabled.  The problem disappears if I remove the second line.

I'm using Emacs 29 built from master earlier today.

Message #8 received at 54237 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Tor Kringeland <tor.a.s.kringeland <at> ntnu.no>
Cc: 54237 <at> debbugs.gnu.org
Subject: Re: bug#54237: Disabling `scroll-bar-mode' fails when setting
 `default-frame-alist'
Date: Thu, 03 Mar 2022 15:55:40 +0100

Tor Kringeland <tor.a.s.kringeland <at> ntnu.no> writes:

>   emacs -Q --daemon -l test.el
>
> where the content of test.el is
>
>   (scroll-bar-mode -1)
>   (setq default-frame-alist '((cursor-color . "#007fff")))
>
> fails to disable `scroll-bar-mode'.  When opening an Emacs client, I
> have to toggle `scroll-bar-mode' two times to disable it.  The first
> time it is "enabled" again (no visible change) and the second time it's
> disabled.  The problem disappears if I remove the second line.
>
> I'm using Emacs 29 built from master earlier today.

`scroll-bar-mode' disables itself by altering default-frame-alist, so I
think what you're seeing is predictable?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #13 received at 54237 <at> debbugs.gnu.org (full text, mbox):

From: Tor Kringeland <tor.a.s.kringeland <at> ntnu.no>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 54237 <at> debbugs.gnu.org
Subject: Re: bug#54237: Disabling `scroll-bar-mode' fails when setting
 `default-frame-alist'
Date: Thu, 03 Mar 2022 16:14:10 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> `scroll-bar-mode' disables itself by altering default-frame-alist, so I
> think what you're seeing is predictable?

I see, I didn't know.  Can I disable `scroll-bar-mode' via
`default-frame-alist' directly?

The problem arose since `set-cursor-color' doesn't work when starting
Emacs as a server so I changed `default-frame-alist' but that enabled
`scroll-bar-mode' ...

Feel free to close this as it's not a bug, then.

Message #16 received at 54237 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Tor Kringeland <tor.a.s.kringeland <at> ntnu.no>
Cc: 54237 <at> debbugs.gnu.org
Subject: Re: bug#54237: Disabling `scroll-bar-mode' fails when setting
 `default-frame-alist'
Date: Thu, 03 Mar 2022 16:20:53 +0100

Tor Kringeland <tor.a.s.kringeland <at> ntnu.no> writes:

>> `scroll-bar-mode' disables itself by altering default-frame-alist, so I
>> think what you're seeing is predictable?
>
> I see, I didn't know.  Can I disable `scroll-bar-mode' via
> `default-frame-alist' directly?

Yes, for new frames, you can just set:

(setq default-frame-alist '((vertical-scroll-bars)))

> The problem arose since `set-cursor-color' doesn't work when starting
> Emacs as a server so I changed `default-frame-alist' but that enabled
> `scroll-bar-mode' ...
>
> Feel free to close this as it's not a bug, then.

Perhaps this quirk should be documented in the scroll-bar-mode doc
string, though?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #19 received at 54237 <at> debbugs.gnu.org (full text, mbox):

From: Drew Adams <drew.adams <at> oracle.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>, Tor Kringeland
 <tor.a.s.kringeland <at> ntnu.no>
Cc: "54237 <at> debbugs.gnu.org" <54237 <at> debbugs.gnu.org>
Subject: RE: [External] : bug#54237: Disabling `scroll-bar-mode' fails when
 setting `default-frame-alist'
Date: Thu, 3 Mar 2022 15:53:05 +0000

> Perhaps this quirk should be documented in the scroll-bar-mode doc
> string, though?

Yes, +1.  Users shouldn't need to look in the code to
find out that "`scroll-bar-mode' disables itself by
altering default-frame-alist".

Message #22 received at 54237 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Tor Kringeland <tor.a.s.kringeland <at> ntnu.no>
Cc: 54237 <at> debbugs.gnu.org
Subject: Re: bug#54237: Disabling `scroll-bar-mode' fails when setting
 `default-frame-alist'
Date: Fri, 04 Mar 2022 16:56:58 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

>> The problem arose since `set-cursor-color' doesn't work when starting
>> Emacs as a server so I changed `default-frame-alist' but that enabled
>> `scroll-bar-mode' ...
>>
>> Feel free to close this as it's not a bug, then.
>
> Perhaps this quirk should be documented in the scroll-bar-mode doc
> string, though?

I've now done so in Emacs 29 in both the scroll-bar-mode and
default-frame-alist doc strings.  (The latter already hinted at there
being problems with setting it directly, but I've made it more
explicit.)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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