GdkWindow: Avoid gdk_device_manager_get_client_pointer()
GdkWindow: Avoid gdk_device_manager_get_client_pointer()

It's now deprecated

grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita