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I have a triangulation "t" of type Triangulation_2.

After some calls of

   vertex_h=t.tds().join_vertices(face_h, index);

I get a strange result (face_h is NOT the last finite face of t).

There is an incident face ("face_A") to vertex_h with following properties:

face_A->neighbor[0] == face_A->neighbor[2]

and the vertices of face_A->neighbor[0] are the same vertices as the 
verices of face_A (except the order).

Is this  behavior correct under some circumstances or is it a bug?

Regards,

Richard Maierhofer
TU Graz