Github user ymarzougui commented on the issue:
https://github.com/apache/flink/pull/2995
Yes, I will see how to add a unit test and try to add a commit to this PR
by the end of the day or tomorrow. Fortunately the fold in `AllWindowStream` is
correct, the problem in `WindowStream` is due to a mistake by me when I
contributed FLINK-3869.
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