| Made PSwing.setVisible lazily call its component's setVisible method depending on its current visibility. This should stop the stack overflow being experienced by Chris Malley. Since I have been unable to reproduce it, I can't test it. | 
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| extras/src/main/java/edu/umd/cs/piccolox/pswing/PSwing.java | 
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| extras/src/test/java/edu/umd/cs/piccolox/pswing/PSwingTest.java | 
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