Re: Scrollbar bug on OS X (was: Aquamacs distro for OS X like behavior)

[David Reitter]

On 6 Apr 2005, at 15:08, Stefan Monnier wrote:

> > Under OS X, Emacs behaves very strangely with regard to the 
> > scrollbars and
> > sliders. When you just click on a slider without moving it (after 
> > you've
> > scrolled to the middle of the document), you will see that the text
> > scrolls right away, often far beyond the document.  Intended behavior
> > would be not to do anything.
>
> The description of the behavior is not sufficiently precise for me to 
> be
> sure, but it looks like a genuine bug.  I'm not sure what you mean by 
> "far
> beyond the document", tho.

It overscrolls: it scrolls down beyond the end of the buffer, so that 
the screen is all empty.
It shouldn't jerk when you click and drag - very often, I grab the 
slider to scroll down a little. When the window jumps to a totally 
different document position, the slider becomes practically useless in 
that usage context.

I acknowledge your explanations on the other points - thanks. In the UI 
that I'd like to implement in order to conform to standards in my 
environment, the vertical slider size shows a proportion of _ displayed 
lines_ not document characters or real lines (those that end with a CR 
or LF). Whether that is better or not, I don't know, but what I do know 
is that a) "less visual change on the screen is more", and that b) both 
Windows and Mac software has sliders with a stable size.

But the slider size should have less priority.

Is there a way to store count-screen-lines statically and just update 
it when necessary?

-- Dave