[mkgmap-dev] Commit r4320: Remove code which tried to implement type=through_route relations.

Version mkgmap-r4320 was committed by gerd on Sat, 26 Oct 2019 Remove code which tried to implement type=through_route relations. Effect: RoadMerger might merge different ways when input data contains such a relation. I did not find any effect on routing. http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4320