Auto-sweepers should pick up materials according to the priority of sweep errands

[Gwido]

In my base, I've build an infinite storage system, that filter each resources or store them on the ground of rooms.

But I encounter a problem.

 

Currently, auto-sweeper pick up material according to some hidden priority list. So, when I got fullerene, the auto-sweeper was ignoring it to pick up clay, or coal, instead. And even if I place a sweep order with priority 9, the auto-sweeper still ignore it.

 

The auto-sweeper should pick up materials with a sweep errand, prior to any other material, and so follow the priority level set on each sweeped material.