[openstreetmap/openstreetmap-website] Enable exporting direction paths (PR #5694)

[Marwin Hochfelsner]

@hlfan commented on this pull request.



> @@ -36,6 +36,9 @@ OSM.Directions = function (map) {
     OSM.DirectionsEndpoint(map, $("input[name='route_to']"), OSM.MARKER_RED, endpointDragCallback, endpointChangeCallback)
   ];
 
+  const exportGroup = L.layerGroup([...endpoints.map(m => m.marker), polyline]);
+  let downloadURL = null;
+

Well, this doesn't need to be done for every route displayed, so I want it to be outside of a function. For the download URL, I want to be able to revoke the last blob URL when creating the new one.
For now, I could drop the marker-color assignment or just export the polyline, as the pages linked in https://github.com/openstreetmap/openstreetmap-website/issues/5224#issuecomment-2362118967 do.

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