[1.0.1953] Near-Infinite Stack Tidying Loop

[MikeLemmer]

I saw a weird bug in stack-tidying. Two stacks of 9 Meals were slightly separated; two colonists decided to tidy up both stacks simultaneously. Each would take 1 Meal from a stack and move it to the other stack, ending up with two stacks of 9 again, so they both tried to tidy up again. They got stuck in this loop for about a half-minute.

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