CP-25880: GraphvizAlgorithm.WriteEdges(..) does not differ between directed and undirected edges

[fubar-coder]

From unknown CodePlex user on Wednesday, 17 December 2014 06:54:27

If I export an undirectedgraph into graphviz, the edges will appear in the dot file as:
Vertex1 -> Vertex2
But because of the graph is undirected the output should look like:
Vertex1 -- Vertex2