Sweeping priority of an object marked for sweeping shown here.
Clicking on something then clicking the sweep button does not bring up the priority bar - have to click out and back onto it.
Sweeping priority bar remains after canceling the sweep operation (sorry, no picture).
Been a bit of a nag on individual things like seeds and other things you might want swept up when you click on them individually.
Select a sweepable object, and click the sweep button in the info panel. The priority bar does not present itself until clicking off of it and then back on it again. It remains, even after the sweep operation is canceled.