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Ondřej Kuzník authored Nov 10, 2021 and Quanah Gibson-Mount committed Jan 18, 2022

A delete of an entry that didn't match filter would be skipped
altogether and the cookie would never be sent to that consumer.

Ondřej Kuzník authored Sep 13, 2021 and Quanah Gibson-Mount committed Jan 12, 2022

A refresh can jump across multiple threads, we cannot just lock a
mutex, we need to track who that is and clear when finished.

In addition to that, fix our internal syncrepl session tracking pulling
it closer to RFC 4533, refreshDone now represents the receipt of
refreshDone flag. Refreshing status is maintained for plain refreshes
(and times when we might be starting one but don't know for sure).

We still reschedule a new sync with a delay if there is another one
running but tracking refreshes this way paves the way to being able to
wake them up if we start tracking them somehow.