Re: [PATCH] Add -O<orderfile> option to diff-* brothers.

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"LT" == Linus Torvalds [off-list ref] writes:

LT> This smells to me like a "cool feature, because we can"
LT> rather than a "this is useful because of xxx".

You could even do the rename/copy detection outside with a
standalone diff-raw filter, just like your "sort-filenames" pipe
example.  Rename/copy is not done that way primarily for the
performance reasons.  Pickaxe is not done that way because we
wanted to conditionally suppress diff-tree headers, and it is
easier to implement the suppression inside rather than as a
"sort-filename" like filter.

This diffcore-order is more like "cool feature, because we can,
_and_ it is simpler to do it inside rather than outside, now we
already have the infrastructure inside to do this kind of thing
for other purposes anyway".