Re: Make scroll-{up, down} move point to {start, end} of newly visible text

[Eli Zaretskii]

> From: Emanuel Berg <incal@dataswamp.org>
> Date: Sun, 06 Aug 2023 22:02:18 +0200
> 
> Eli Zaretskii wrote:
> 
> > We have this only for scrolling with the scroll bar: see
> > scroll-bar-adjust-thumb-portion. Implementing this for every
> > possible kind of scrolling would need changes to C code,
> > I think, since scrolling is actually performed by the
> > display engine.
> 
> If one can get the state of scrolling in a window in Elisp one
> could solve this in Elisp only since then one could write
> a new scroll function on top of the old, and what it would do
> is - based on that information - it would either scroll
> normally or not call the function at all, if scrolling was
> determined not to make any sense.

I think your mental model of how scrolling works in Emacs is not
accurate.  What do you think "scrolling functions" do in Emacs?