bug#52705: 29.0.50; Flashing popups when x-gtk-use-system-tooltips is nil in pgtk

[Po Lu]

martin rudalics <rudalics@gmx.at> writes:

> More importantly, the initial phantom frame with a simple
>
> (setq x-gtk-use-system-tooltips nil)
>
> disappears so you can make Aleksandr happy ...
>
> Unfortunately, I'm now getting
>
> (emacs:2257): Gdk-CRITICAL **: 16:19:41.208: gdk_window_set_cursor: assertion 
> 'GDK_IS_WINDOW (window)' failed
>
> (emacs:2257): Gdk-CRITICAL **: 16:19:41.231: 
> gdk_window_create_similar_surface: assertion 'GDK_IS_WINDOW (window)' failed
>
> which I do not get without the patch.  Any ideas?

I tried to fix those warnings on master.  Thanks.