ADDITIONAL SYSTEM INFORMATION :
java version "23.0.1" 2024-10-15
Java(TM) SE Runtime Environment (build 23.0.1+11-39)
Java HotSpot(TM) 64-Bit Server VM (build 23.0.1+11-39, mixed mode, sharing)

A DESCRIPTION OF THE PROBLEM :
JComboBox popup width does not expand properly when using AbsoluteLayout and custom cell rendering (see attached example). It would be desirable that JComboBox could expand properly independently of the Layout.

----------- BEGIN SOURCE -----------
import javax.swing.*;
import java.awt.*;

public class ComboBoxBugExample {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame("Bug Example");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setLayout(null);

            JComboBox<String> comboBox = new JComboBox<>(new String[]{
                    "Short",
                    "A much longer item to test",
                    "The longest item in the combo box"
            });

            comboBox.setBounds(50, 50, 150, 30);
            comboBox.setPrototypeDisplayValue("The longest item in the combo box");

            frame.add(comboBox);
            frame.setSize(400, 300);
            frame.setVisible(true);
        });
    }
}
----------- END SOURCE -----------