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BUG: InteractorEventRecorder results in warning about passive observer.

Dan Lipsa requested to merge danlipsa/vtk:TestSphereWidget into master

The InteractorEventRecorder watches key press events using a passive observer. A delete event was also added as a passive observer but the delete event caused removing an observer which resulted in the warning. The warning was: vtkObject.cxx:533 Passive observer should not call AddObserver or RemoveObserver in callback. for vtkInteractionWidgetsPython-TestSphereWidget and maybe other tests.

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