问为什么设置JDialog或JFrame setVisible(true)会切换输入法设置？

EN

import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.Locale;

public class MainWindow {

private JFrame frame;
private Locale l;

/**
 * Create the application.
 */
public MainWindow() {
    initialize();
}

/**
 * Initialize the contents of the frame.
 */
private void initialize() {

    l = new Locale("zh", "zh_TW");

    frame = new JFrame();
    frame.setLocale(l);
    frame.setBounds(100, 100, 450, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JButton btnNewButton = new JButton("New button");
    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {

            JDialog d = new JDialog(frame, "Run", true);
            d.getContentPane().add(new JLabel("dsad"));
            d.setMinimumSize(new Dimension(150, 100));
            d.setLocationRelativeTo(null);
            d.setLocale(l);
            d.setVisible(true);

        }
    });
    frame.getContentPane().add(btnNewButton, BorderLayout.CENTER);
}

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                MainWindow window = new MainWindow();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}


}