Method closeEvent

scripts/config/qconf.cc:1749–1784

* ask for saving configuration before quitting */

 * ask for saving configuration before quitting
 */
void ConfigMainWindow::closeEvent(QCloseEvent* e)
{
	if (!conf_get_changed()) {
		e->accept();
		return;
	}

	QMessageBox mb(QMessageBox::Icon::Warning, "qconf",
		       "Save configuration?");

	QPushButton *yb = mb.addButton(QMessageBox::Yes);
	QPushButton *db = mb.addButton(QMessageBox::No);
	QPushButton *cb = mb.addButton(QMessageBox::Cancel);

	yb->setText("&Save Changes");
	db->setText("&Discard Changes");
	cb->setText("Cancel Exit");

	mb.setDefaultButton(yb);
	mb.setEscapeButton(cb);

	switch (mb.exec()) {
	case QMessageBox::Yes:
		if (saveConfig())
			e->accept();
		else
			e->ignore();
		break;
	case QMessageBox::No:
		e->accept();
		break;
	case QMessageBox::Cancel:
		e->ignore();
		break;
	}
}

void ConfigMainWindow::showIntro(void)
{