bug#11070: 24.0.94; Large stippled images not displayed consistently

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: darthandrus@gmail.com,  rgm@gnu.org,  11070@debbugs.gnu.org
> Date: Sun, 29 Sep 2019 20:33:54 +0200
> 
> > Then some redisplay optimization is at work here.  If your build was
> > configured with --enable-checking=glyphs, does the problem go away if
> > you set _all_ of the following variable non-nil?
> >
> >   inhibit-try-cursor-movement
> >   inhibit-try-window-id
> >   inhibit-try-window-reusing
> 
> No, that doesn't change anything.

What about just typing "M-x" -- does that fix the display?

> But I now see more clearly what's not being updated -- it copies all the
> bits in the background on the line that's being moved.

Yes, that was clear from your original images.