bug#62707: 30.0.50; [PATCH] Non toolkit scroll bar handle

[Eli Zaretskii]

> Date: Fri, 07 Apr 2023 08:46:14 +0200
> From:  Manuel Giraud via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> I'd like to fix how the handle of scroll bars in non-toolkit build keeps
> changing size when scrolling a file.

Fix it in what way? what is wrong with what we have now?

> This first patch does not do this but it just simplify how those
> scroll bar are drawn.

Please explain the rationale for each part of this change.  It isn't
obvious, at least not to me.

Thanks.