This bug can only be reproduced on Linux. I'm using RedHat Linux 8.0.

Step to reproduce:
- Install M2 PIT 04 build j2re on Linux.
- Start Java Web Start application manager.
- Move mouse to the border of AM, let the icon to become 'resize the window'
  icon.
- Now resize the window, trying to make it smaller in the direction you choose,
  you can then even go further to drag the mouse so that the window size is
  actually negative. (You will only see a very small window on the screen now.)

- If you take the same action on other window, like a terminal, the window can
  not be smaller once you reach a minimal level.


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