[RFC diff-tree -c with copy/rename]

From current git tree:

$ git-diff-tree -r -m -C bb266cb118 (I removed extra useless lines)

bb266cb11842f76712ebff1d8b1bd086dc65337f
:100644 100644 dfb1c44 8d0dbad R093	checkout-index.c	builtin-checkout-index.c
:100644 100644 357970d 7d39d9b R083	verify-pack.c	builtin-verify-pack.c
:100644 100644 6484cb9 6484cb9 R100	builtin-help.c	help.c

bb266cb11842f76712ebff1d8b1bd086dc65337f
:100644 100644 29ea6fd 8d0dbad M	builtin-checkout-index.c
:100644 100644 d700761 7d39d9b M	builtin-verify-pack.c
:100644 100644 7a7f775 6484cb9 M	help.c


$ git-diff-tree -r -c -C bb266cb118

bb266cb11842f76712ebff1d8b1bd086dc65337f
::100644 100644 100644 dfb1c44 29ea6f 8d0dbad RM	builtin-checkout-index.c
::100644 100644 100644 357970d d70076 7d39d9b RM	builtin-verify-pack.c
::100644 100644 100644 6484cb9 7a7f77 6484cb9 RM	help.c

Is it correct do not show in -c case:

- the similarity value
- the origin file:

As example

'R093MM	checkout-index.c builtin-checkout-index.c'

 instead of current

'RM	builtin-checkout-index.c'


Thanks
Marco

P.S: -c with --stat gives both origin and destination files
(checkout-index.c and builtin-checkout-index.c):

$ git-diff-tree -r -c -C --stat bb266cb118
bb266cb11842f76712ebff1d8b1bd086dc65337f
 Makefile                                     |   81 +++++++++++++++---------
 checkout-index.c => builtin-checkout-index.c |   26 ++++----
 builtin-count.c => builtin-count-objects.c   |    0
 name-rev.c => builtin-name-rev.c             |    4 +
 pack-objects.c => builtin-pack-objects.c     |    4 +
 symbolic-ref.c => builtin-symbolic-ref.c     |    4 +
 unpack-objects.c => builtin-unpack-objects.c |    7 +-
 verify-pack.c => builtin-verify-pack.c       |   15 ++---
 builtin.h                                    |   80 ++++++++++++------------
 git.c                                        |   86 ++++++++++++++------------
 builtin-help.c => help.c                     |    0
 11 files changed, 166 insertions(+), 141 deletions(-)
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