Jaroslav Tulach 835ac05218 Engine should send notification about node status (#3729) ... When nodes get invalidated in the cache, they have to be recomputed. Let the IDE know which of the nodes are pending by sending `Api.ExpressionUpdate.Payload.Pending` message. # Important Notes This PR introduces new `Api.ExpressionUpdate.Payload.Pending` message. This message is delivered before re-computation of nodes. Later `Api.ExpressionUpdate.Payload.Value` or other is sent to notify the IDE that a value for given node is available. Trivial implementation of of the `Api.ExpressionUpdate.Payload.Pending` message in the IDE is provided by this PR to (improperly) visualize pending node status - further improvements needed in follow up PRs.		2022-09-28 12:35:12 +00:00
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src	Engine should send notification about node status (#3729)	2022-09-28 12:35:12 +00:00