Re: [PATCH 0/2] Make diff plumbing commands respect the indentHeuristic.

Jeff King [off-list ref] writes:

I do feel a bit sad about breaking this case (or at the very least
forcing you to set an option to retain cross-version compatibility). But
my gut says that we don't want to lock ourselves into never changing the
diff algorithm (and I'm sure we've done it inadvertently a few times
over the years; even the recent switch to turning on renames would have
had that impact).

IIRC, we never promised that different versions of Git produce the
same patch ID for the same change.  I do share that sadness, as not
making that promise would affect not just such an external database
keyed with patch-ids but also affects the rerere database, and those
who heavily depend on the rerere database would need to refresh them
every time diff/merge algorithm is updated, using something like
contrib/rerere-train.sh script.

But at the same time, I am very much against promising that the
textual diff output will never improve for human readability.