-- pad out one node fully, and all other nodes just enough to keep them from overlapping.
-- We don't want cascading movements to get too chaotic.
prepare_to_move = function(target)
	populate_collision_data()
	-- give the target a little more buffer
	target.hs.x = target.hs.x + 50
	target.hs.y = target.hs.y + math.max(30, math.min(target.h/3, 200))
end