bug#30088: 26.0.90; [Emacs 26] Rendering glitch

[Charles A. Roelli]

> From: Damien Cassou <damien@cassou.me>
> Cc: npostavs@users.sourceforge.net, 30088@debbugs.gnu.org
> Date: Fri, 26 Jan 2018 13:33:20 +0100
> 
> Damien Cassou <damien@cassou.me> writes:
> > I have inhibit-double-buffering set to t for some time and haven't
> > witnessed the problem again.
> 
> I set the variable's value back to its default and rapidly got the
> problem.

Thanks for checking.  Maybe it would be worth mentioning this problem
in etc/PROBLEMS on the emacs-26 branch.