Fix Executor WaitFor race condition #66
Merged
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Fixes a race condition whereby pending work items are added to the waiting set after they are actually sent on the work item queue. This means in scenarios where the work item is processed very quickly (i.e. a no-op workflow or activity), the work item is attempted to be completed before it is logged.
Updates the wait for funcs to add the items to the pending set before sending them on the work item queue.