win32: Resurrect some enter/leave notify events for native windows
win32: Resurrect some enter/leave notify events for native windows

The button highlighting in testgtk works again, even with
GDK_NATIVE_WINDOWS. Unfortunately testgtk:menus still does
not work for the forced-native-window-case.

Adamovskiy/gtk,ebassi/gtk,alexlarsson/gtk,Distrotech/gtk2,grubersjoe/adwaita,Sidnioulz/SandboxGtk,ahodesuka/gtk,ebassi/gtk,Adamovskiy/gtk,msteinert/gtk,chergert/gtk,jigpu/gtk,Adamovskiy/gtk,chergert/gtk,jadahl/gtk,jessevdk/gtk,grubersjoe/adwaita,Distrotech/gtk2,Lyude/gtk-,jigpu/gtk,chergert/gtk,jessevdk/gtk,chergert/gtk,alexlarsson/gtk,ahodesuka/gtk,davidgumberg/gtk,Sidnioulz/SandboxGtk,Adamovskiy/gtk,ahodesuka/gtk,bratsche/gtk-,jadahl/gtk,Adamovskiy/gtk,jadahl/gtk,grubersjoe/adwaita,alexlarsson/gtk,ahodesuka/gtk,msteinert/gtk,grubersjoe/adwaita,alexlarsson/gtk,davidgumberg/gtk,chergert/gtk,davidt/gtk,jessevdk/gtk,jessevdk/gtk,ahodesuka/gtk,Sidnioulz/SandboxGtk,grubersjoe/adwaita,Lyude/gtk-,msteinert/gtk,jigpu/gtk,grubersjoe/adwaita,Distrotech/gtk2,Distrotech/gtk2,alexlarsson/gtk,davidgumberg/gtk,Lyude/gtk-,bratsche/gtk-,Adamovskiy/gtk,ebassi/gtk,jadahl/gtk,bratsche/gtk-,jessevdk/gtk,davidt/gtk,jigpu/gtk,jigpu/gtk,ebassi/gtk,chergert/gtk,alexlarsson/gtk,jadahl/gtk,msteinert/gtk,davidt/gtk,ahodesuka/gtk,davidt/gtk,bratsche/gtk-,jadahl/gtk,jadahl/gtk,Sidnioulz/SandboxGtk,Adamovskiy/gtk,ebassi/gtk,jessevdk/gtk,Lyude/gtk-,Adamovskiy/gtk,Lyude/gtk-,Sidnioulz/SandboxGtk,Lyude/gtk-,bratsche/gtk-,Sidnioulz/SandboxGtk,davidgumberg/gtk,grubersjoe/adwaita,jessevdk/gtk,Lyude/gtk-,grubersjoe/adwaita,jigpu/gtk,jadahl/gtk,davidt/gtk,jigpu/gtk,chergert/gtk,chergert/gtk,davidt/gtk,Distrotech/gtk2,Distrotech/gtk2,Lyude/gtk-,ebassi/gtk,jigpu/gtk,bratsche/gtk-,msteinert/gtk,alexlarsson/gtk,davidgumberg/gtk,msteinert/gtk,davidgumberg/gtk,ahodesuka/gtk,alexlarsson/gtk,davidgumberg/gtk,ahodesuka/gtk,davidgumberg/gtk