Re: [PATCH v1] dir.c: don't flag the index as dirty for changes to the untracked cache

Duy Nguyen [off-list ref] writes:

Please don't do that, at least not this way. cache_changed mask should
reflect all dirty parts in .git/index. If UNTR extension is not marked
updated, it's legit to just skip generating/writing it down (e.g. if I
kept the old UNTR extension from the last time I read .git/index
around in memory)

Excellent point.  Thanks for mentioning this (it crossed my mind
when I responded but I forgot to metion in my message).