Unclear It is not clear whether this behaviour is switched on.
What
A task can be moved to the background so it can deliver a message later. When you stop a turn, for example with Esc, waiting updates from those tasks are now put back in the queue as passive. A passive update does not start the model working again. The tasks are then stopped.
Before, the tasks were only stopped.
Why
This keeps an old update from a stopped task from waking the model after you have told it to stop.
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The writer flagged doubt
It is not clear whether this behaviour is switched on.