gtk/print.go
func (ps *PrintSettings) SetScale(scale float64) {
	C.gtk_print_settings_set_scale(ps.native(), C.gdouble(scale))
}
func (ps *PrintSettings) SetScale(scale float64) {
	C.gtk_print_settings_set_scale(ps.native(), C.gdouble(scale))
}
// SetScale() is a wrapper around gtk_print_settings_set_scale().