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

[Eli Zaretskii <eliz@gnu.org>]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: 62707@debbugs.gnu.org
> Date: Fri, 07 Apr 2023 11:14:27 +0200
> 
> Manuel Giraud <manuel@ledu-giraud.fr> writes:
> 
> [...]
> 
> >> Fix it in what way? what is wrong with what we have now?
> >
> > When I'm scrolling a file (with 'C-v'/'M-v' for example), the handle of
> > the vertical scroll bar has its height that keeps changing even though
> > the same amount of text is showed (there is no long line breaking
> > involved).  I think it is distracting and weird but I may be missing
> > something.
> 
> I think I kind of understand my issue here: the non-toolkit tool bar
> handle is reflecting the number of *characters* actually displayed
> (against all characters in the buffer).  That is why depending on lines
> "fullness" it can vary.

Yes.  AFAIK, all our implementations of scroll-bar behave like that,
always did.

> Maybe it a feature then.  WDYT?

If it's going to be a feature, it will have to affect all the
scroll-bar implementations, not just the no-toolkit one.