79ad6a3148
Part of #118145. - Specialize the algorithm for each geometry type. - Store the cache in an array instead of an attribute. Attributes are meant to store user-edited data, not derived data like caches. - Calculate the island IDs with a parallel disjoint set instead of a flood-fill algorithm. - Avoid storing the island ID array if there is only one island, saving 1 byte per vertex. Pull Request: https://projects.blender.org/blender/blender/pulls/125907
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