wayland: Only process the event if it's for a GdkWindow
wayland: Only process the event if it's for a GdkWindow

When we combine GTK with Clutter we will receive events for both surfaces that
we have created as well as those created by Clutter.

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