Fix case for curved edges when centroid is identical to the midpoint of an edge
Fix case for curved edges when centroid is identical to the midpoint of an edge

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