Fix snapping nearby boundary of avoid polygons

[sfendrich]

Is there an existing issue for this?

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Problem description

Nearby the boundary of an avoid polygon the start or end point of a route request may snap to a wrong edge. This happens, when the polygon intersects the edge, to which the start point should snap, because this removes the whole edge. The points then snap to different nearby edges, which lead to wrong results.

Proposed solution

Introduce virtual points when snapping with avoid areas.

Additional context

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Forum Topic Link

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