Re: Improving Scroll Bar Tools

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 12 May 2024 16:10:46 +0000
> From: Heime <heimeborgia@protonmail.com>
> Cc: help-gnu-emacs@gnu.org
> 
> On Monday, May 13th, 2024 at 3:01 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
> > > How can a package know whether a window-specific setting was introduced by
> > > set-window-scroll-bars ?
> > 
> > By looking at the value returned by window-scroll-bars.
> > 
> > > Would you be kind enough to show the specific use of scroll-bar-mode-hook and
> > > its ilk for the purpose you have in mind, so I can develop it ?
> > 
> > 
> > Sorry, I don't have time (and I don't really know what you'd like to
> > do when frame's scroll-bars are changed). I can describe the idea: in
> > the hook function use set-window-scroll-bars to change the
> > window-specific scroll bars according to what you want.
> 
> Eli, when set-window-scroll-bars have been applied to a window I want to know
> some settings were applied.  That what you'd like to know.

But I just told you how to do that, above: use window-scroll-bars.
Its doc string explains how to know whether a window-specific scroll
bars were set for the window by set-window-scroll-bars.

> Once a window settings have been changed by set-window-scroll-bars, how can
> one release the change and make them once again affected by the minor modes.

Use set-window-scroll-bars.  Its doc string tells you how to call it
so that the window will again use frame-global settings of scroll bars.

> In a previous comment, you described that the aforementioned situation might
> not be a good idea because their use is not designed for such sort of thing.
> What would be the standard procedure then, to kill or close the window ?

No, I said that window-specific settings take precedence over
frame-globals ones, and that coding a feature that would work
otherwise is not recommended.