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

[Eli Zaretskii <eliz@gnu.org>]

> From: Spencer Baugh <sbaugh@janestreet.com>
> Date: Thu, 17 Aug 2023 08:19:55 -0400
> 
> > or moves it into the viewport.
> 
> exactly this code.  e.g. in window_scroll_line_based there's calls to
> Fvertical_motion, I'd want to add more logic just before those calls.
> I'd need to do the same for window_scroll_pixel_based.

That'd not be my first choice.  I'd actually suggest to study how
scroll-preserve-screen-position is implemented, and do something
similar.

> > This scrolling is general display feature, it can happen even if
> > something other than a scrolling command caused it.  Thus, knowing
> > when to move point to a particular place is not trivial, and would
> > need some variable exposed to Lisp or something like that, and then
> > some non-trivial logic to use that.
> 
> Hm, not sure why I'd need logic in Lisp

If that variable would hold the position of point for after the
scroll, you'd need some logic to set the value.