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would fail on coplanar faces (or smooth verts). Loop remapping is really a tricky topic... For now, we enhance a bit more our Frankenfunc by using distance between dest and source polygons as fallback in case we have too much similar normals... Probably not a perfect solution, but should be robust enough I hope. One core question remains open though: do we want to stick to 'use only seams to detect UV islands'? This makes things much simpler, but will obviously fail in case of actual islands without matching seams. :/