[Issue 583] A disposed Graphics2D remains in Canvas3D after removal and addtion

https://java3d.dev.java.net/issues/show_bug.cgi?id=583



User kcr changed the following:

                What    |Old value                 |New value
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                  Status|NEW                       |STARTED
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------- Additional comments from kcr@... Thu May 15 18:56:12 +0000 2008 -------
Good catch of the NPE. The root cause of this is a missing check for
hasBeenDisposed in the dispose() method, so I'll add that in addition to the
null check that you suggested. I will commit the fix today, and it will be in
tomorrow's daily build.


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