- run SwingSet2 demo (java -jar SwingSet2.jar)
- as soon as main window comes up, grab one of the floating frames and
drag it around.
- As the second icon paints in the toolbar, the app frequently hangs.
You may need to try this a few times to reproduce the problem, as it is
very timing-dependent. I don't think it really has anything to do with the
second toolbar icon, but I had the most success reproducing the problem when I started my dragging operation as soon as the window opened and it usually hangs
on the second toolbar icon.