ref: 3d3d00991a728a5cb7a1cbb7ba4985057043beb9
parent: b25fcc3f2621b0b41f3ae7cdabe57ed07f62d2c2
author: Simon Tatham <anakin@pobox.com>
date: Sun Sep 11 10:22:32 EDT 2005
Run the final solution-reduction pass in both directions, since Gareth managed to find an example (10x8#458168771440033 in r6289) where running it in only one direction failed to eliminate an obviously redundant piece of path. [originally from svn r6290] [r6289 == b25fcc3f2621b0b41f3ae7cdabe57ed07f62d2c2]