bug#72323: 31.0.50; line-move unconditionally resets vscroll to 0

[Steven Allen via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Per the title, `line-move' unconditionally sets vscroll to 0:

    (set-window-vscroll nil 0 t)

Unfortunately, this causes several issues when using
`pixel-scroll-precision-mode':

1. Moving the cursor up/down, to the beginning of the line, or to the
end of the line resets vscroll causing the entire window to "jump".
2. It breaks `pixel-scroll-precision-mode' in Evil because
`evil-adjust-cursor' calls `move-end-of-line' internally. Whenever the
cursor is in a blank line, scrolling "sticks" unless you scroll fast
enough to scroll more than a partial line.

I'm submitting a patch to Evil to work around the second issue, but
having the entire window jump whenever I first move the cursor
up/down/end/home immediately after scrolling is still a bit annoying.

Fixing home/end (beginning of line, end of line) case seems trivial:
don't call `line-move' in these cases (or have `line-move' short-circuit
when `arg' is 0). However, even after reading all the comments about
scrolling images, I'm still not sure why it's necessary to reset vscroll
to 0. After commenting this line out, I can't tell a difference, even
when scrolling images with and without `auto-window-vscroll' and
`try-vscroll'. I was hoping Kim could shed some light on this.

In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, cairo version
 1.18.0) of 2024-07-24 built on Laptop
Repository revision: 2f5af5cab3869af426631735f12acf30798136bf
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101013
System Description: Arch Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
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Important settings:
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Major mode: notmuch-show

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