bug#27932: 26.0.50; Feature request: prevent scroll commands from changing the buffer location of point

[Eli Zaretskii]

> From: Richard Stallman <rms@gnu.org>
> CC: dmoncayo@gmail.com, 27932@debbugs.gnu.org
> Date: Sat, 05 Aug 2017 16:19:52 -0400
> 
>   > And then there are higher-level issues, like what does this mode mean
>   > when scroll-conservatively is in effect.
> 
> Person could try it whichever way is easiest and see if person likes it.

I was thinking about the person who will need to decide how to code
that.

In several places we behave under scroll-conservatively with the
explicit goal of keeping point visible in the very first/last
sufficiently-visible screen line: this might need to be changed if
keeping point visible is no longer a requirement.