Pure refactor, will self-accept.
1 patch for repository http://darcs.net/screened:
patch f931ec31518b349de20ca963801eed7a9d5dd479
Author: Ben Franksen <ben.franksen@online.de>
Date: Sun Sep 19 08:55:32 CEST 2021
* add and use a few generic Gap utilities
This also re-implements freeLeftToFL as unFreeLeft . joinGapsFL and then
inlines it at its two call sites.