HandleObstructedMove contains logic to drop long waypoints, should they be occupied by units (because that can get the pathfinder stuck, since the long-range pathfinder can find a path, but not the vertex one.

However PathResult already drops waypoints this way, so this code can be removed for simplification.

Order a unit to move such that a long waypoint ends up in a group of unit, inaccessible. Notice that the waypoint gets dropped and the unit isn't stuck.