Barend Gehrels f803c0cae2 [overlay] stop discarding uu turns. Discard cc turns colocated with uu turns.
Including uu turns is necessary to handle cases as in #recursive_boxes_17 and also for
validity of output polygons.
This also makes code simpler for now, removing the separate uu handling from
for example select_rings
2016-01-03 13:17:17 +01:00
..