Re: Correct way to implement `pixel-point-and-height-at-unseen-line'?

[Po Lu <luangruo@yahoo.com>]

Eli Zaretskii <eliz@gnu.org> writes:

> And you didn't describe why do you need
> pixel-point-and-height-at-unseen-line's data in the first place, so
> maybe there's a different solution to whatever you are trying to do
> that doesn't involve such a function.

It's used to find a suitable new start position that's N pixels above
window start, so vscroll can then be set to compensate for the
difference.  For instance, scrolling up by a delta of 1 pixel if vscroll
is already zero will move to such a start position, and set vscroll to
the returned height - 1.

Thanks.