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Where two open paths lie along the same stretch, the planar map gave that stretch to one of them only, so a merge or an erase across it left the other path in place there. Every other open path along an edge now has its own piece in `lines_under`, under a closed path's outline or along a line in front. `lines`, `edges` and Live Paint's edges stay one per stretch, and an Alt-click there still takes the piece in front.