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Author SHA1 Message Date
John Firebaugh 11d723819d Difference#extantIDs 2013-02-02 19:47:56 -05:00
John Firebaugh ddc5e324f6 Extract iD.Difference 
iD.Difference represents the difference between two graphs.
It knows how to calculate the set of entities that were
created, modified, or deleted, and also contains the logic
for recursively extending a difference to the complete set
of entities that will require a redraw, taking into account
child and parent relationships.

Additionally, all history mutators now return a difference.
 2013-02-02 19:47:56 -05:00