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Instead of explicit work queue stop before any possibly used engine manager is destructed. Based on an assumption that any engine manager can be destructed independently from the work queue destruction. This model is already used in CellPreloader that conflicts with explicit work queue stop. After the work queue is requested to be stopped, any client waiting for a not started work item to be done will wait forever because the work item is dropped from the queue. Therefore either clients should not wait for own work items to be completed in destructor or the work queue should not drop items before clients are destructed. Other approaches are possible but are not considered due to increasing complexity. CellPreloader already tries to wait for all created work items to be done so keep it that way and extend the model to AsyncScreenCaptureOperation and Scene. Additionally abort all scheduled work items when owner is destructed. This prevents a long exit when multiple screenshots are scheduled right before exiting the game.