gtk/print.go
func (po *PrintOperation) SetUnit(unit Unit) {
	C.gtk_print_operation_set_unit(po.native(), C.GtkUnit(unit))
}
func (po *PrintOperation) SetUnit(unit Unit) {
	C.gtk_print_operation_set_unit(po.native(), C.GtkUnit(unit))
}
// SetUnit() is a wrapper around gtk_print_operation_set_unit().