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[Jean-Philippe Pons <>]

Dear CGAL developers, 

test_facet may return 'true' when testing a facet which creates a
non-manifold vertex. So that a subsequent call to add_facet will
unexpectedly fail. 

This is because test_facet only checks if one of the vertices of the novel
facet already has a full cycle of facets, which is not sufficient. It does
not check if the novel facet closes a cycle, while there is another
component of facets. 

I have checked that the problem still exists in the latest version. 

Cheers, 

Jean-Philippe 

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