Traces when moving swing windows

Question

Hello,
when I move a swing frame to another place on the sceen, thereby crossing over another frame, the moving frame leaves traces on the lower one in the form of white cascading stripes. I first thought this is due to my old graphic board. But now I have a new computer with Win7 and it's still the same. Moreover I observed that the traces happen only on swing windows and never on other applications' windows.
Is this a peculiarity of my site or a common phenomenon?

Answer 1

Joerg22 wrote:
Well, the "empty" panel I just mentioned, is shown when the JFrame comes up and the application "waits" for some menu being selected. That should not block the EDT, does it? Since there is no other activity in the appliction, I wonder whether suspending the EDT will make a change, but I'm ready to run any test you want me to.With just two frames I mean:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.JFrame;
public class TestFrames {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                JFrame red = new JFrame("RED");
                red.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                red.getContentPane().setBackground(Color.RED);
                red.setPreferredSize(new Dimension(800, 600));
                red.pack();
                red.setLocationRelativeTo(null);
                red.setVisible(true);
                JFrame green = new JFrame("GREEN");
                green.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                green.setPreferredSize(new Dimension(800, 600));
                green.getContentPane().setBackground(Color.GREEN);
                green.pack();
                green.setLocationRelativeTo(red);
                green.setVisible(true);
}If that doesn't show the stripes moving one frame over the other, I suggested to manually suspend the EDT while debugging to see if that will cause the same stripes. If it produces much more artifacts, then the stripes are probably not caused by a blocked EDT.