Re: Improving Scroll Bar Tools

[Heime <heimeborgia@protonmail.com>]

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On Saturday, May 11th, 2024 at 8:31 PM, Eli Zaretskii <eliz@gnu.org> wrote:

> > Date: Sat, 11 May 2024 07:28:33 +0000
> > From: Heime heimeborgia@protonmail.com
> > Cc: help-gnu-emacs@gnu.org
> > 
> > Sent with Proton Mail secure email.
> > 
> > On Saturday, May 11th, 2024 at 6:54 PM, Eli Zaretskii eliz@gnu.org wrote:
> > 
> > > > Date: Sat, 11 May 2024 00:12:11 +0000
> > > > From: Heime heimeborgia@protonmail.com
> > > > Cc: Po Lu luangruo@yahoo.com,
> > > > Heime via Users list for the GNU Emacs text editor help-gnu-emacs@gnu.org
> > > > 
> > > > I have seen that applying vertical and horizontal scroll bars with
> > > > 
> > > > (set-window-scroll-bars (selected-window) nil 'right nil 'bottom nil)
> > > > 
> > > > will not let the following to take complete effect an all windows in frame
> > > > 
> > > > (scroll-bar-mode 1)
> > > > (horizontal-scroll-bar-mode 0)
> > > 
> > > The ELisp manual clearly says that set-window-scroll-bars overrides
> > > the frame-specific settings of scroll bars.
> > 
> > This is a problem because if one forgets changing some window with
> > set-window-scroll-bars, and the modes do not work, it is a problem.
> > 
> > If one wants to remove horizontal scroll in all windows in frame,
> > the command should be expected to do so, nothwithstanding any
> > previous changes with a different command (e.g. set-window-scroll-bars).
> 
> 
> You are mixing two different levels of functions. scroll-bar-mode and
> horizontal-scroll-bar-mode are user commands, whereas
> set-window-scroll-bars is a Lisp function. If there is a
> contradiction between them, it is a problem for the user-level
> functionality which mixes them, and it is up to that user-level
> functionality (presumably, some code you have written) to fix the
> problem, whatever it is.

How do users change the scroll bars of specific windows ?
 
> Since scroll-bar-mode and horizontal-scroll-bar-mode are minor modes,
> they each one have a hook, which could be used to turn off
> window-specific scroll bars. However, I don't recommend that because
> that would prevent users from having window-specific scroll bars that
> do not heed to frame-global settings. IOW, you will be coding a
> feature that works against documented Emacs behavior.

Ok, you want the minor modes not to affect window-specific scroll bars that
users customised.