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2a5a5180e9
Previously, we would erroneously always go into the `WaitingUser` (now called `WaitingBehaviour`) state after receiving a message on an inbound stream. However, the `AddProvider` message does not warrant a "response" from the behaviour. Thus, any incoming `AddProvider` message would result in a stale substream that would eventually be dropped as soon as more than 32 inbound streams have been opened. With this patch, we inline the message handling into the upper match block and perform the correct state transition upon each message. For `AddProvider`, we go back into `WaitingMessage` because the spec mandates that we need to be ready to receive more messages on an inbound stream. Fixes #3048.