GNU bug report logs - #72331
29.4; Modifying horizontal-scroll-bar does not fully work (MacOS only)

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Jared Finder <jared <at> finder.org>
Cc: 72331 <at> debbugs.gnu.org
Subject: bug#72331: 29.4; Modifying horizontal-scroll-bar does not fully work (MacOS  only)
Date: Sun, 04 Aug 2024 11:33:34 +0300

> Date: Sat, 27 Jul 2024 22:10:06 -0700
> From:  Jared Finder via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> Directly modifying the variable horizontal-scroll-bar on MacOS doesn't
> show a scroll bar unless the frame also has the horizontal-scroll-bars
> frame  parameter set.  This only happens on MacOS, on Linux and Windows
> everything behaves as I would expect.
> 
> To reproduce, define the following function:
> 
> (defun bug-report-toggle-buffer-horizontal-scroll-bar ()
>    "Like `toggle-scroll-bar', but for just the current buffer.
> And for horizontal scroll bars.  I guess it's acutally very
> different."
>    (interactive)
>    (setq horizontal-scroll-bar (if horizontal-scroll-bar nil 'bottom))
>    (set-window-buffer (selected-window) (current-buffer)))
> 
> Then run M-x bug-report-toggle-buffer-horizontal-scroll-bar repeatedly
> and observe that on MacOS space gets reserved for the horizontal scroll
> bar but no scroll bar is rendered.  Finally, run M-x
> horizontal-scroll-bar-mode and observe that now the horizontal scroll
> bar is properly shown and hidden.
> 
> I also tested this on master and observed the same behavior.

Thanks.

Could some macOS user please look into this?

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