[Dot] Layout failed when use twopi and ortho at the same time

[GadgetSteve]

Ported Issue from Mantis Original ID: 2426 Reported By: tang3w

SEVERITY: CRASH Submitted: 2014-02-26 01:38:53

DESCRIPTION

Layout failed when use twopi and ortho at the same time

STEPS TO REPRODUCE

GraphViz version: 2.36.0

input:

digraph g {
    layout=twopi
    splines=ortho
    a -> b
}

output:

Assertion failed: (np->cells[1]), function chkSgraph, file maze.c, line 315.