| undid stack clean up in r647 since it caused a pretty major break in ScrollExample and others. That's what I get for thinking I'm being clever. | 
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| core/src/main/java/edu/umd/cs/piccolo/PCamera.java | 
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| core/src/main/java/edu/umd/cs/piccolo/PNode.java | 
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| core/src/main/java/edu/umd/cs/piccolo/util/PPaintContext.java | 
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