Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2995
Thanks a lot, this looks like the correct fix.
Usually, we add a small unit test to such fixes to guard the bugfix.
Also, the same problem probably exists in the `AllWindowStream`. Would be
nice to fix that as well as part of this issue.
Would you be up for following up?
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