8549bc94de
The code for marking seams or sharp in a bevel was nonsense for terminal edges (beveled edges that are the only beveled edge at a vertex). It was written assuming that either the number of segments is 1 or there is a mesh ADJ pattern, which is not the case if there is a terminal edge with segments > 1. The immediate fix for infinite loops is to project against trying to execute this code for terminal edges. Also made current code clearer and removed duplication. It is a future TODO to make it do something sensible for terminal edges instead of a no-op. Incidentally I notice that it also doesn't work for mitered booleans, but it won't infinite loop in that case. To fix both of these cases, we should try to count boundary vertices to skip rather than edges to skip.
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