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>
> Date: Sat, 01 Aug 2020 03:39:57 -0700
> 
> (progn
>  (global-hl-line-mode)
>  (setq scroll-margin 5)
>  (setq scroll-conservatively 101)
>  (view-hello-file)
>  (end-of-buffer))
> 
> Then (previous-line) until you see the problem.

I only see this when EOB is before end of the window, which I don't
think is a bug.