Re: diff machinery cleanup

Jeff King [off-list ref] writes:

Ah, OK, that makes more sense. Is there any reason then that this
wouldn't work (it certainly seems to, but I don't want to be causing
invisible problems that will come back later)?

It should.  I wanted to avoid re-reading the index from the
filesystem for some reason I cannot justify anymore.  The
response was sent before my first caffeine for the day, perhaps
that was the reason ;-).