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Ensure DeleteEvent disconnects vtkQtConnection.

Nicolas Vuaille requested to merge nicolas.vuaille/vtk:fix_vtkQtConnection_callback_on_DeleteEvent into master

Problem was:

  • A vtkObject with many observers invoke DeleteEvent.
  • One of this observer has focus so we don't loop on remainders.
  • vtkQtConnection Callback is in remainders.
  • There is no disconnection.

Solution: Add a callback as passive observer for DeleteEvent.

cf vtkSubjectHelper::InvokeEvent()

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