fix for LC bug report 22297 - needs unsubscribe #17
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This patches the property inspector to do a revUnsubscribeAll on closing.
The problem reported in bug report 22297 being that the property inspector subscribes to the idePropertyChanged message but doesn't unsubscribe from that message if the selected object hasn't changed, as for example if you try to edit the script of an object after having looked at its properties. This will trigger a recurring error display and require closing the IDE.