bug#47498: 28.0.50; follow-mode misses a line with tiling window manager

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Tue, 30 Mar 2021 10:36:23 -0500
> 
> >  > 3. M-x follow-mode RET
> >  >
> >  > There is now one line missing from the display.  When using
> >  > `display-line-numbers-mode', this effect is more obvious.
> >
> > Which line?  Can you post a screenshot?
> 
> Please see the attached.

Probably because there's a header-line, or the bread-crumbs display
property at the top of the window.