bug#7910: 23.2; inconsistent scrolling

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> It's according to the doc string, AFAICT.  If the OP wants the cursor
> to _always_ retain its screen position, he should set
> scroll-preserve-screen-position to a non-nil. non-t value.

Setting the variable to `always' works for me, but the doc string is
misleading here.

---
A value of t means point keeps its screen position if the scroll
command moved it vertically out of the window, e.g. when scrolling
by full screens.
---

If you're on the next-to-last line, `C-v' will not move point out of the
window -- the next-to-last line will end up as the first line.

And there's further peculiarities with the t setting -- if you're at the
next-to-last visual line, `C-v' will put point on the first visual
line.  `C-v' again, and it's on the next-to-last line again.  So it'll
alternate first/next-to-last after every `C-v'.

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