Chamfer propagation mode.
Once running on an egde, a chamfer operation may propagate onto other
edges that extend the first one. This mode controls the chamfer ability
to do so.
Values:
catTangencyChamfer
The chamfer operation also chamfers any other edges
found at the first edge extremities, as long as they are tangent with
it. This process repeats until no more tangent edges to chamfer are
found at extremities of already chamfered ones.
catMinimalChamfer
The chamfer operation stops as soon as an edge to chamfer cuts
one or the two chamfer created edges