bug#32032: 26.1; Emacs 26 opens under X with blank window

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  32032@debbugs.gnu.org
> Date: Tue, 03 Jul 2018 11:20:15 +0200
> 
> >> Try disabling double-buffering (etc/NEWS describes how to do that).
> >
> > Thanks Eli. That works. :-)
> >  
> > Any way to *build* Emacs so that  it disables by default double-buffering?
> 
> It doesnʼt look that way, if configure finds the Xdbe extension Emacs
> uses it. You could add
> 
> '(inhibit-double-buffering . t)
> 
> to default-frame-alist, or uninstall the Xdbe.h header.

Given that there are known bugs with this feature that no one is
working on, perhaps we should introduce an optional configure switch
to build without double-buffering.