bug#13476: 24.3.50; Reverting scroll-bar face customization has no effect

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Mauro Aranda <maurooaranda@gmail.com>,  13476@debbugs.gnu.org,
>   stephen.berman@gmx.net
> Date: Tue, 01 Mar 2022 08:30:15 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I don't understand why we need to set the frame parameter when the
> > customize the face to begin with, I guess.
> 
> Because that's what you would expect to happen: customizing the
> foreground or background of the scroll-bar face should affect the scroll
> bar colors, which are frame parameters.

So this face is special in that we handle it via frame parameters?  In
that case, please add a comment to that effect where you made the
change.