server : fix incoming tasks not process in order (#15008) #15395
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With 3+ concurrent requests sending back-to-back tasks, one (or more if you add more concurrent requests) get stuck in the deferred queue almost until you stop sending new requests.
When a previous task is completed and pop_deferred_task is called there is already a newly received task in queue_tasks so the task poped from queue_tasks_deferred queue will be second in queue_tasks so it will later deferred again (as last) in queue_tasks_deferred queue.
In this PR we change it so that poped task is at front of queue_tasks_deferred so will be the one executed next.