popover: listen harder on the widget being pointed to
popover: listen harder on the widget being pointed to

Hierarchy, size allocation and widget visibility are now listened
to in order to update the popover state accordingly.

Lyude/gtk-,davidgumberg/gtk,alexlarsson/gtk,chergert/gtk,Adamovskiy/gtk,Sidnioulz/SandboxGtk,jigpu/gtk,davidgumberg/gtk,grubersjoe/adwaita,grubersjoe/adwaita,Lyude/gtk-,jigpu/gtk,davidgumberg/gtk,ahodesuka/gtk,grubersjoe/adwaita,ahodesuka/gtk,alexlarsson/gtk,grubersjoe/adwaita,ahodesuka/gtk,Adamovskiy/gtk,grubersjoe/adwaita,jessevdk/gtk,jigpu/gtk,davidgumberg/gtk,jigpu/gtk,Adamovskiy/gtk,Lyude/gtk-,Lyude/gtk-,jadahl/gtk,davidgumberg/gtk,Lyude/gtk-,jessevdk/gtk,jadahl/gtk,chergert/gtk,jessevdk/gtk,jigpu/gtk,chergert/gtk,Lyude/gtk-,Sidnioulz/SandboxGtk,jadahl/gtk,ahodesuka/gtk,alexlarsson/gtk,davidgumberg/gtk,jessevdk/gtk,msteinert/gtk,Lyude/gtk-,grubersjoe/adwaita,chergert/gtk,jigpu/gtk,msteinert/gtk,alexlarsson/gtk,chergert/gtk,Sidnioulz/SandboxGtk,alexlarsson/gtk,chergert/gtk,jadahl/gtk,Adamovskiy/gtk,ahodesuka/gtk,alexlarsson/gtk,jigpu/gtk,alexlarsson/gtk,Adamovskiy/gtk,Lyude/gtk-,msteinert/gtk,chergert/gtk,davidgumberg/gtk,msteinert/gtk,ahodesuka/gtk,jessevdk/gtk,Adamovskiy/gtk,grubersjoe/adwaita,jigpu/gtk,msteinert/gtk,jessevdk/gtk,davidgumberg/gtk,jadahl/gtk,Adamovskiy/gtk,ahodesuka/gtk,ahodesuka/gtk,jadahl/gtk,chergert/gtk,Sidnioulz/SandboxGtk,jadahl/gtk,jadahl/gtk,Sidnioulz/SandboxGtk,jessevdk/gtk,msteinert/gtk,Sidnioulz/SandboxGtk,grubersjoe/adwaita,alexlarsson/gtk,Adamovskiy/gtk