// notice that the native GTK+ implementation is only available since
// (relatively recent) 2.18 so we inherit from the generic one to be able to
// fall back to it if GTK+ version is determined to be too old during run-time
// notice that the native GTK+ implementation is only available since
// (relatively recent) 2.18 so we inherit from the generic one to be able to
// fall back to it if GTK+ version is determined to be too old during run-time