bug#39458: 26.3; move-overlay affects the scroll-margin feature

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Tue, 27 Oct 2020 19:46:23 +0100
> Cc: 39458@debbugs.gnu.org
> 
> "Geza, Herman" <geza.herman@gmail.com> writes:
> 
> > Load a several-page large text file, and scroll down to the
> > bottom. Try to position the document in a way that the window has an empty
> > space at the bottom. Now, move the cursor upwards. Notice, that you can
> > move the cursor at the very top of the window, the scroll-margin value
> > is ignored. If you continue moving, the document will fill the whole
> > window, and now emacs will take scroll-margin value into consideration.
> 
> I can reproduce this bug in Emacs 26.3, but not in Emacs 28, so I'm
> going to go ahead and guess that it's been fixed

Probably by the fix to bug#42653.