Maps are by default squared, but not all draw the whole area. So it sometimes occurs, that large white chunk of one map overlays an other map. Currently one can adjust the transparency of the whole map, but the readability of the map suffers. So my suggestion would be a checkbox that one can tick and then no white polygons are drawn, just like there is a checkbox right now that controls whether polygons are drawn at all. Woud this be feasible and solve the problem?
Issue #435 resolved