Summary:
Here I'm implementing equality methods for ARTGroup, ARTShape and ARTText and I'm using these methods to update the state only when it is necessary.
This will improve perf in rendering of ART
changelog: [Internal]
Reviewed By: JoshuaGross
Differential Revision: D21695127
fbshipit-source-id: b438ddea4c34bd7a0bdf26a6aac4fd62a9f78b49