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Jeff Baumes authored
ENH: Add a PassiveObserver flag to vtkCommand. Passive observers do not change the system state, and always get events, even if another command has focus. Change vtkObject to process passive observers first. ENH: Change vtkInteractorEventRecorder to have PassiveObserver commands. ENH: Change InteractorStyleTreeMapHover to use the vtkInteractorEventRecorder.
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