JCombobox focusLost没有解雇 - 为什么会这样？

import com.intellij.ui.components.JComboBox;
import com.intellij.ui.components.JComboBox.ComboBoxEditor;
import com.intellij.ui.components.JComboBox.FocusHandler;
import com.intellij.ui.components.JComboBox.ListCellRenderer;
import com.intellij.ui.layout.BorderLayout;
import com.intellij.ui.layout.BoxLayout;
import com.intellij.ui.layout.GridLayout;
import com.intellij.ui.layout.RowLayout;
import com.intellij.ui.paint.PaintUtil;
import com.intellij.ui.settings.BeanContext;
import com.intellij.ui.settings.BeanContext.Setting;
import com.intellij.ui.settings.PropertyEditor;
import com.intellij.ui.util.ComponentUtil;
import com.intellij.ui.util.TextUtil;

import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.*;
import java.awt.event.ItemEvent;
import java.util.Objects;

class JComboBoxFocusLostTest {
    private JComboBox<String> jComboBox;
    private JLabel jLabel;

    private void createAndShowGUI() {
        JFrame frame = new JFrame("JComboBox Focus Lost Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel mainPanel = new JPanel(new BorderLayout());

        jComboBox = new JComboBox<>();
        jComboBox.addItem("Item 1");
        jComboBox.addItem("Item 2");
        jComboBox.addItem("Item 3");

        jLabel = new JLabel("Label");

        Border border = BorderFactory.createLineBorder(Color.BLACK);
        jComboBox.setBorder(border);
        jLabel.setBorder(border);

        mainPanel.add(jComboBox, BorderLayout.CENTER);
        mainPanel.add(jLabel, BorderLayout.SOUTH);

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

    private void setFocusToComboBox() {
        jComboBox.requestFocusInWindow();
    }

    private void checkComboBoxValue() {
        String selectedItem = (String) jComboBox.getSelectedItem();
        jLabel.setText(selectedItem != null ? selectedItem : "Item not selected");
    }

    private void createListeners() {
        jComboBox.addItemListener(e -> {
            ItemEvent itemEvent = e;
            if (itemEvent.getStateChange() == ItemEvent.SELECTED) {
                checkComboBoxValue();
            }
        });
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JComboBoxFocusLostTest comboBoxFocusLostTest = new JComboBoxFocusLostTest();
            comboBoxFocusLostTest.createAndShowGUI();
        });
    }
}