bug#25666: Screen rendering bug

[Eli Zaretskii]

> From: Fredrik Ljungdahl <fredde1994@gmail.com>
> Date: Fri, 10 Feb 2017 10:12:31 +0100
> Cc: 25666@debbugs.gnu.org
> 
> Here is a screenshot: http://home.fiq.se/emacsfail.png
> This is in my personal Emacs environment, but it shows the same way in the 
> default one. Note the right
> screen (And no, that isn't the end of the file)

So the problem is that the right-side window gets its contents
scrolled and its lower half emptied?  Or is there something else?