ref: 87302428703f10732d907cfefe46a28ce9a5ebbc
parent: a5891971c1450ad8fdb985eea09bcbd8bf9f25a5
author: Simon Tatham <anakin@pobox.com>
date: Thu Sep 15 14:09:27 EDT 2005
Optimisation patch from Mike: remember which squares we've entirely finished dealing with, and don't do them again on the next loop. [originally from svn r6312]