Interface for listening to null selection changes.
This interface should be implemented by selection listeners
that want to be notified when the selection becomes null.
It has no methods. It simply indicates the desire to receive
null selection events through the existing
selectionChanged method. Either the part or the
selection may be null.
nullselection changes.This interface should be implemented by selection listeners that want to be notified when the selection becomes
null. It has no methods. It simply indicates the desire to receivenullselection events through the existingselectionChangedmethod. Either the part or the selection may benull.