Chain action getting canceled by parent task

[grinder81]

Hey folks,

I was having some issues when a parent action was canceled, the long-chain effect is getting canceled as well. To explain the issue I used the TCA VoiceMemos example app. To reproduce the issue, here are the steps:

1. Go to VoiceMemos reducer
2. Around line 70 change the code as follows:

case let .recordingMemo(.presented(.delegate(.didFinish(.success(recordingMemo))))):
        state.recordingMemo = nil
        state.voiceMemos.insert(
          VoiceMemo.State(
            date: recordingMemo.date,
            duration: recordingMemo.duration,
            url: recordingMemo.url
          ),
          at: 0
        )
          return .run { send in
              try await self.clock.sleep(for: .seconds(5))
              print("Sleeping is over")
          }

3. The main change is

return .run { send in
              try await self.clock.sleep(for: .seconds(5))
              print("Sleeping is over")
          }

instead of return .none
4. Of course you need to include the clock dependency

From this code what do we expect?

1. We start recording
2. Stop recording after a while
3. state.voiceMemos is saving the new recording
4. And finally we are executing another task where we are sleeping for 5 sec
5. After 5 second we should expect the print statment

But that doesn't happen in that case.

After digging more and more I found following code is the culprit:

        async let startRecording: Void = send(
          .audioRecorderDidFinish(
            TaskResult { try await self.audioRecorder.startRecording(url) }
          )
        )

Basically when recording is ending, somehow it's canceling my sleeping task but why is that? If I change that code instead of the recording then everything is just working fine and I'm getting the sleeping print nicely. Please correct me if I'm thinking something wrong here.

[grinder81]

To identify or dig more, I would love to know when exactly that effects is getting canceled. I think that would be very helpful.

[Sajjon]

@grinder81 are you using any .task ViewModifier in the parent or child features view?