PGTK+ warning

[Alessandro Bertulli]

Hi all!

I managed to compile the latest version of Emacs. I enabled the PGTK+
feature, and now when I start Emacs I got the warning (in a GTK warning
dialog box) that says:

"You are trying to run Emacs configured with the "pure-GTK" interface
under the X Window System. That configuration is unsupported and will
lead to sporadic crashes during transfer of large selection data. It
will also lead to various problems with keyboard input."

Note that I am on Wayland, but for some reason (that I'll investigate)
XWayland seem to take precedence, so effectively I'm on X, I suppose.
For now, I don't have any issues of the one described, but I wondered:

1) Why do I see this warning? Isn't PGTK supported? Is Xorg the problem?

2) Is there a way to disable this pop up? Right now it steals focus from
Emacs, and it's a bit cumbersome to manually close it every time.

Thanks!
-- 
Alessandro Bertulli