bdae3e28a2
Previously the method of picking the "target" duplicate wasn't deterministic from a user perspective. The behavior has been changed so: - For a cluster of 3 or more vertices, use the vertex closest to the centroid. - For a cluster of 2 use the lowest index. This mitigates #78916, solving some cases where clusters have a central vertex although can't be considered fixed as the 2 vertex case doesn't work so well. Added a BLI_kdtree_{N}d_calc_duplicates_cb function that lets the caller choose the index to keep from a cluster of duplicates. Refactored from !145851. Ref !146492 Co-authored-by: tariqsulley <tariqsulley3c@gmail.com>
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