GNU bug report logs - #62676
Setting `scroll-bar-width` Doesn't Take Effect Immediately

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Package: emacs;

Reported by: Shynur Xie <one.last.kiss <at> outlook.com>

Date: Wed, 5 Apr 2023 08:24:01 UTC

Severity: normal

Tags: notabug

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#62676; Package emacs. (Wed, 05 Apr 2023 08:24:01 GMT) Full text and rfc822 format available.
Acknowledgement sent to Shynur Xie <one.last.kiss <at> outlook.com>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Wed, 05 Apr 2023 08:24:01 GMT) Full text and rfc822 format available.

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

From: Shynur Xie <one.last.kiss <at> outlook.com>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: Setting `scroll-bar-width` Doesn't Take Effect Immediately
Date: Wed, 5 Apr 2023 08:18:00 +0000

Example:

```
$ emacs -Q
```

Now the current buffer is "*scratch*", evaluating:

```
(setq scroll-bar-width 50)
```

changes nothing.

Instead, user need to switch to another buffer and then switch back:

```
(progn
  (setq scroll-bar-width 50)
  (switch-to-buffer "*Messages*")
  (switch-to-buffer "*scratch*"))
```

________________________________________

emacs-version: 28.2
system-configuration: x86_64-w64-mingw32
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#62676; Package emacs. (Wed, 05 Apr 2023 09:03:01 GMT) Full text and rfc822 format available.

Message #8 received at 62676 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Shynur Xie <one.last.kiss <at> outlook.com>
Cc: 62676 <at> debbugs.gnu.org
Subject: Re: bug#62676: Setting `scroll-bar-width` Doesn't Take Effect
 Immediately
Date: Wed, 05 Apr 2023 12:02:25 +0300

tags 62676 notabug
thank

> From: Shynur Xie <one.last.kiss <at> outlook.com>
> Date: Wed, 5 Apr 2023 08:18:00 +0000
> 
> Example:
> 
> ```
> $ emacs -Q
> ```
> 
> Now the current buffer is "*scratch*", evaluating:
> 
> ```
> (setq scroll-bar-width 50)
> ```
> 
> changes nothing.
> 
> Instead, user need to switch to another buffer and then switch back:
> 
> ```
> (progn
>   (setq scroll-bar-width 50)
>   (switch-to-buffer "*Messages*")
>   (switch-to-buffer "*scratch*"))
> ```

This is the expected and documented behavior.  From the ELisp
Reference manual:

     If you do not specify a window’s scroll bar settings via
  ‘set-window-scroll-bars’, the buffer-local variables
  ‘vertical-scroll-bar’, ‘horizontal-scroll-bar’, ‘scroll-bar-width’ and
  ‘scroll-bar-height’ in the buffer being displayed control the window’s
  scroll bars.  The function ‘set-window-buffer’ examines these variables.
  If you change them in a buffer that is already visible in a window, you
  can make the window take note of the new values by calling
  ‘set-window-buffer’ specifying the same buffer that is already
  displayed.

Your last recipe calls set-window-buffer indirectly, so it succeeds
where the original recipe failed.
Added tag(s) notabug. Request was from Eli Zaretskii <eliz <at> gnu.org> to control <at> debbugs.gnu.org. (Wed, 05 Apr 2023 09:03:02 GMT) Full text and rfc822 format available.
Reply sent to Eli Zaretskii <eliz <at> gnu.org>:
You have taken responsibility. (Wed, 05 Apr 2023 09:55:02 GMT) Full text and rfc822 format available.
Notification sent to Shynur Xie <one.last.kiss <at> outlook.com>:
bug acknowledged by developer. (Wed, 05 Apr 2023 09:55:03 GMT) Full text and rfc822 format available.

Message #15 received at 62676-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Shynur Xie <one.last.kiss <at> outlook.com>
Cc: 62676-done <at> debbugs.gnu.org
Subject: Re: bug#62676: Setting `scroll-bar-width` Doesn't Take Effect
 Immediately
Date: Wed, 05 Apr 2023 12:55:09 +0300

> From: Shynur Xie <one.last.kiss <at> outlook.com>
> Date: Wed, 5 Apr 2023 09:18:58 +0000
> 
> Thanks.  No further questions.

Thanks, closing.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Wed, 03 May 2023 11:24:10 GMT) Full text and rfc822 format available.
This bug report was last modified 2 years and 46 days ago.

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