Fix case where async receivers could miss wake ups#177
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Imberflur wants to merge 2 commits into
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Between checking for a message and re-adding the hook to the queue it is possible for the receiver to miss a wake up for a new message. Previously, there was a check afterwards for disconnects but not for new messages.
I added a new test that failed before this commit.
Inspired by https://github.com/rklaehn/flume-bug-reproducer/ (although that mistakenly identified this bug as an issue with cancellation safety).