stream.segmented: fix wait() in writer thread-pool #5236
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The `SegmentedStreamWriter`'s `_wait` event needs to be set before awaiting the shutdown of the thread-pool executor, otherwise the threads of the executor won't ever receive this signal. For example, queued segment downloads can't be cancelled because the event never gets set before awaiting the shutdown of the executor, so `wait()` calls in the executor's threads time out regularly and return `True`.
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The
SegmentedStreamWriter's_waitevent needs to be set before awaiting the shutdown of the thread-pool executor, otherwise the threads of the executor won't ever receive this signal. For example, queued segment downloads can't be cancelled because the event never gets set before awaiting the shutdown of the executor, sowait()calls in the executor's threads time out regularly and returnTrue.Fixes queued DASH segments being downloaded after closing the stream.