157e7e0351
Support propagation of attributes from the original mesh edges when generating mesh edges. This implies both deduplication of original edges and creation of new edges needed for faces. While original edges are not propagated, attributes are still propagated if an edge was part of any face. To make original edges distinct we simply choose the first one to be a value source. One important part of this patch is definition of invariant of the mesh on input: 1. All edges must be valid (their vertices must be correct). The algorithm only deal with duplicate and implicit edges. 2. There is no way to provide info about corner edges attribute (whether it'svalid or not). If all input edges are valid and there are no new edges then we could skip re-generation of already valid corner edge indices. But for now we always do. The new implementation depends on input mesh invariant so this drops an old patch to fix hard crash related with duplicate edge vertices. New code will crash independently to such patch. Hopefully there must be no problems after #138633. The changes don't affect performance much. If anything, in some cases the edge calculation can become a few percent faster. See the PR for more performance testing details. Pull Request: https://projects.blender.org/blender/blender/pulls/132492
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