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[Zohar <>]

I'm not clear about the edge to be collapsed selection process. I'll try to
understand it from the code, but I think that the documentation can be
clearer about this. I have two types of constraints on edges:

1. A constraint that isn't going to change, and this edge would never be
collapsed.
2. A temporary constraint that is relevant to the current mesh state, and
might change (be lifted/removed) later, when the mesh changes.

I put both types in EdgeConstraints::is_constrained(), but clearly it's a
mistake. For example, in Edge_collapse_visitor_base::OnCollected() it seems
that constrained edges (even temporary) would never be checked again. So I'm
guessing that temporary constraints should be added to
Edge_collapse_visitor_base::OnSelected() or MyPlacement::operator().



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