Fix #5023 race condition bug in wf engine #5029
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if operation completes after getAvailableChanges, the inProcess set might be empty, even tho stateChangeQueue is not. * verify stateChangeQueue is empty also
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Is this a bugfix, or an enhancement? Please describe.
Fixes #5023
Describe the solution you've implemented
prevent race condition around checking if no more changes to wf engine state are available