Undo model observer - when to remove?

Undo model observer - when to remove?

Postby ittayd » Sun Jun 18, 2017 11:50 am

I want to attach a ModelObserver to react to onTransactionUndo (is that the right approach to undo an operation when there's more than geometry?). But when do I remove it? Is there a way to know the limit of the undo stack and when my operation is out of it?
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