Only attempt to flush queue if the underlying worker pool is not finished (#18593)
* Only attempt to flush queue if the underlying worker pool is not finished There is a possible race whereby a worker pool could be cancelled but yet the underlying queue is not empty. This will lead to flush-all cycling because it cannot empty the pool. Signed-off-by: Andrew Thornton <art27@cantab.net> * Apply suggestions from code review Co-authored-by: Gusted <williamzijl7@hotmail.com> Co-authored-by: Gusted <williamzijl7@hotmail.com>tokarchuk/v1.17
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