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when snapping line layers Because the default behavior of the snapper is to insert extra vertices into the snapped geometry in order to make it 'follow' the reference geometries exactly, this can result in unwanted results for line layers where the resultant snapped layer has overlapping line segments. Since we can't always know what the desired result is that the user wants (maybe they do want overlapping lines), instead give them control over the result by exposing extra enum options which never insert extra vertices.