Hi,

Based on some first gadgets I build, it would be useful if the Wave
gadget API would support:

- Online presence of participants in the wave. Currently you can only
see who is a participant, but not if they are in the wave
- the stateCallback provides the delta which caused the state change.
This is useful when the Shared state is a large object and you only
want to update a gadget based on the delta.

e.g.

function stateChanged(state, delta) {
  // state is the full state
  // delta is the changed part of the state
}

setStateCallback(stateChanged);


Are there more developers who would find this useful?

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