Re: Redisplay resets vscroll when window start changes

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  emacs-devel@gnu.org
> Date: Wed, 17 Nov 2021 08:26:52 +0800
> 
> Michael Welsh Duggan <mwd@md5i.com> writes:
> 
> > As you can see, the vscroll has reset, despite simply doing
> > cursor-movement within the visible reason.  This is the behavior that I
> > believe Po Lu is complaining about.  Why should cursor movement that
>           ^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> Minor correction: I wasn't the source of this complaint, some other
> people were.

My suggestion is to implement equivalents of C-n/C-p that do what you
want, instead of asking for previous/next-line to be able to preserve
the vscroll, because those commands aren't supposed to support the use
case you want to support.