bug#38497: 27.0.50; Frame is not rendered when frame-resize-pixelwise it 't

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@gmail.com>
> Date: Mon, 16 Dec 2019 21:04:15 +0800
> Cc: 38497@debbugs.gnu.org
> 
> > Could you try the patch below?
> 
> Redrawing started working with this patch. Thank you!

It would be interesting to see whether this change also fixes some of
the other bugs which reportedly disappear when double-buffering is
disabled.