Regression introduced between b34 and b36. To reproduce, load any application like SwingSet2. Use the standard windows key combination ALT-F4 to shut down the application.

On b34 the application will be shut down. On b36 it will not.

>>>> SimpleUI.java
import javax.swing.*;

public class SimpleUI extends JFrame {
    
    public SimpleUI() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
getContentPane().add(new JLabel("Windows: Press ALT-F4 to close"));
pack();
setVisible(true);
    }

    public static void main(String[] args) {
(new SimpleUI());
    }
}
<<<< SimpleUI.java