I hope to one day push the highlighting inside of git itself. That should make it more efficient, and we can do a true LCS diff to find the common parts, rather

I hope to one day push the highlighting inside of git itself. That should make it more efficient, and we can do a true LCS diff to find the common parts, rather than the front/back heuristic it currently does (see the diff-highlight README for the gory details). It's just a little complicated because of the way it interacts with existing internal diff features (in particular the whitespace-error highlighting).