How to make extension that is called on every edit of the document ?

16 Nov
2015
16 Nov
'15
1:02 p.m.
Hi, I'd like to make an extension that keeps track of changes (and can also make changes from external sources) in a drawing - is there a way to get a call every time an edit happens ? (I guess ideally the callback would include information about what was changed). S++
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Stuart Axon