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

[martin rudalics]

> I tried to fix those warnings on master.  Thanks.

This one is still here:

(emacs:1348): Gdk-CRITICAL **: 09:25:18.556: gdk_window_create_similar_surface: 
assertion 'GDK_IS_WINDOW (window)' failed

Also I noticed that native tooltip positions are (or can be?) off by a
couple of lines and their frames do not have any borders (which usually
are only on top and left here anyway).

BTW: I cannot toggle the tool bar from the menu bar.  If it's here
initially, it stays there.  If it's not here initially, I can't get it
back.

Thanks, martin