The fix for bug 2471 wasn't complete, as dot can pass a virtual edge into makeStraightEdges, which assumes that the first edge is real so it can find the actual head node.
The fix for bug 2471 wasn't complete, as dot can pass a virtual edge into
makeStraightEdges, which assumes that the first edge is real so it can find
the actual head node.

ellson/graphviz,kbrock/graphviz,kbrock/graphviz,pixelglow/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,kbrock/graphviz,jho1965us/graphviz,ellson/graphviz,ellson/graphviz,jho1965us/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,ellson/graphviz,ellson/graphviz,kbrock/graphviz,BMJHayward/graphviz,BMJHayward/graphviz,ellson/graphviz,kbrock/graphviz,pixelglow/graphviz,kbrock/graphviz,pixelglow/graphviz,jho1965us/graphviz,BMJHayward/graphviz,jho1965us/graphviz,BMJHayward/graphviz,jho1965us/graphviz,jho1965us/graphviz,kbrock/graphviz,jho1965us/graphviz,BMJHayward/graphviz,jho1965us/graphviz,BMJHayward/graphviz,pixelglow/graphviz,pixelglow/graphviz,kbrock/graphviz,MjAbuz/graphviz,MjAbuz/graphviz,MjAbuz/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,kbrock/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,ellson/graphviz,pixelglow/graphviz,BMJHayward/graphviz,pixelglow/graphviz,pixelglow/graphviz,BMJHayward/graphviz,ellson/graphviz,kbrock/graphviz,pixelglow/graphviz,MjAbuz/graphviz,MjAbuz/graphviz,jho1965us/graphviz,MjAbuz/graphviz,kbrock/graphviz,MjAbuz/graphviz,jho1965us/graphviz,jho1965us/graphviz,pixelglow/graphviz,pixelglow/graphviz