Don’t call didReceiveError twice if deadline is exceeded and request is canceled afterwards
#609
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Motivation
If the deadline is exceeded and the connection state machine fails the request with an error, we forgot to transition to the finished state in the
RequestBag. A symptom of this is that a request could afterwards still be canceled from user code and it would trigger a second call to the delegatesdidRecieveErrormethod.Modification
Result
didReceiveErrorcan't be called twice