Do not publish when nothing is being changed/updated

[EdwardLu2018]

Say we have this series of calls (in a loop, or something):

scene.update_object(box, click_listener=True)
scene.update_object(box, click_listener=True)
scene.update_object(box, click_listener=True)
scene.update_object(box, click_listener=True)
scene.update_object(box, click_listener=True)
etc...

Only the first call should actually do the publishing (make a network call), the rest should not do anything. The library should recognize that the click-listener of the box is already true and not do anything when updating.

[hi-liang]

Wondering what the overhead would be like to deep-compare each pending publish JSON msg from the preceding one, ignoring animation types and so forth.