bug#66769: 30.0.50; pixel-scroll-precision-mode and scroll-margin regression

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

> What is the "target point" in the above text? target for what?

The position where point will be moved after the window start and
vscroll are adjusted, which is such that redisplay will not recenter or
otherwise undermine the scrolling operation.

> Why not use the too-slow posn-at-point, but only in this case?

Because with that, precision scrolling slows down to a crawl.