如果父窗口不在焦点中，则Java11上的JComboBox不会在第一次单击鼠标时显示弹出菜单

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class ComboBoxDemo {
    public static void main(String[] args) {
        JFrame frame = new JFrame("ComboBox Demo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        String[] options = {"Option 1", "Option 2", "Option 3"};
        JComboBox<String> comboBox = new JComboBox<>(options);
        comboBox.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                comboBox.showPopup();
            }
        });

        frame.add(comboBox);
        frame.pack();
        frame.setVisible(true);
    }
}