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Comment on "NSTreeController and Drag and Drop"
by Scott Stevenson — Mar 14
All observedObject does is return the actual object that the proxy refers to. Given that it's private API, it is possible that this would go away in the future, but I've been told by people that should know that this will probably keep working.

In reality, even if this API did go away, the necessary changes would probably be very minor. A small price to pay for something that works in the here and now.
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