Zheng, Lei 611e79af53 App: insert UUID property to trace the source of copied object ...

A property _ObjectUUID will be added to an object before it is being to
copied, if the property does not exists. Anoter propert _SourceUUID
property will be added to any copied object, with value set to its
source objct's _ObjectUUID.

2021-12-21 21:41:02 -07:00

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