gtkwindow: Do not show subsurface windows for hidden popover widgets
gtkwindow: Do not show subsurface windows for hidden popover widgets

This is really just necessary when we have a visible widget, otherwise
the window would temporarily linger with odd size and surface.

https://bugzilla.gnome.org/show_bug.cgi?id=743427

davidgumberg/gtk,Adamovskiy/gtk,jadahl/gtk,alexlarsson/gtk,chergert/gtk,ahodesuka/gtk,Adamovskiy/gtk,davidgumberg/gtk,jigpu/gtk,Lyude/gtk-,grubersjoe/adwaita,chergert/gtk,Lyude/gtk-,jigpu/gtk,ahodesuka/gtk,chergert/gtk,jadahl/gtk,jadahl/gtk,ahodesuka/gtk,grubersjoe/adwaita,Adamovskiy/gtk,grubersjoe/adwaita,Lyude/gtk-,Adamovskiy/gtk,Adamovskiy/gtk,davidgumberg/gtk,jigpu/gtk,grubersjoe/adwaita,Lyude/gtk-,alexlarsson/gtk,davidgumberg/gtk,chergert/gtk,alexlarsson/gtk,ahodesuka/gtk,grubersjoe/adwaita,chergert/gtk,Lyude/gtk-,alexlarsson/gtk,ahodesuka/gtk,grubersjoe/adwaita,chergert/gtk,jigpu/gtk,jadahl/gtk,jigpu/gtk,jadahl/gtk,grubersjoe/adwaita,Adamovskiy/gtk,ahodesuka/gtk,davidgumberg/gtk,alexlarsson/gtk,jigpu/gtk,grubersjoe/adwaita,jigpu/gtk,Lyude/gtk-,chergert/gtk,alexlarsson/gtk,chergert/gtk,alexlarsson/gtk,davidgumberg/gtk,jadahl/gtk,ahodesuka/gtk,alexlarsson/gtk,jigpu/gtk,Lyude/gtk-,Adamovskiy/gtk,jadahl/gtk,ahodesuka/gtk,davidgumberg/gtk,jadahl/gtk,Lyude/gtk-,davidgumberg/gtk,Adamovskiy/gtk