870f75b790
Fix #79163 bug related to the bevel operation producing disconnected UVs for new bevel faces. This change replaces previous approach using scattered and selective usage of functions: bev_merge_uvs, bev_merge_edge_uvs and bev_merge_end_uvs with one coherent technique for all stages of the bevel operation. It is utilizing a concept of loop (BMLoop) buckets to keep track of UV vertices that should be merged at the end of bevel operation by a single call to bevel_merge_uvs function. This approach doesn't touch initial UV position calculation done by interpolation algorithm in bev_create_ngon function and keeps the concept of representative faces (called frep, facerep or rep_face in code) to help decide to which bucket specific loops should be assigned. This is from PR https://projects.blender.org/blender/blender/pulls/139595, which has more explanation and discussion.
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