bug#42653: 28.0.50; scroll-margin is sometimes ignored with hl-line/display-line-numbers-mode

[Eli Zaretskii]

> From: Kevin Liu <kevin@nivekuil.com>
> Cc: 42653@debbugs.gnu.org
> Date: Sun, 02 Aug 2020 20:18:20 -0700
> 
> On  2 August 2020 19:28, Eli Zaretskii <eliz@gnu.org> wrote:
> 
> > Please show a test case for each of these two, as I don't think I've
> > seen them in my testing.
> 
> My original test case should demonstrate this as well, as the buffer
> should be scrolled beyond EOB.  Then (previous-line) up until EOB is
> back out of view, then scroll back down and the problem should be
> visible.  I also recorded a video for illustration in case this is one
> of those only-on-my-machine cases (which it might be, as I built off a
> merged native-comp branch): https://www.youtube.com/watch?v=EKrbrVGbEZw
> 
> (progn
>   (global-hl-line-mode)
>   (setq scroll-margin 5)
>   (setq scroll-conservatively 101)
>   (view-hello-file)
>   (end-of-buffer))

Very well, I've now removed the EOB test.