Look at the diffs between ad6571a78ac74e9fa27e581834709067dba459af and
it's parent with and without rename detection enabled.  (In linux-2.6
git tree)

(formated for narrow screens)
$ REV=ad6571a78ac74e9fa27e581834709067dba459af
$ git-diff-tree -r  $REV^1 $REV | grep termios.h
:000000 100644 0000000000000000000000000000000000000000
   237533bb0e9f1a3e640c4906d8b350deafd315b9 A      include/asm-powerpc/termios.h
:100644 000000 97c6287a6cbaa5903ee1a5934a5553e9e485d8e7
   0000000000000000000000000000000000000000 D      include/asm-ppc/termios.h
:100644 000000 02c3d283aa62bc1b4d7c5d1b22ce03ee4b8771eb
   0000000000000000000000000000000000000000 D      include/asm-ppc64/termios.h

$ git-diff-tree -r  -M $REV^1 $REV | grep termios.h
:000000 100644 0000000000000000000000000000000000000000
   237533bb0e9f1a3e640c4906d8b350deafd315b9 A      include/asm-powerpc/termios.h
:100644 000000 97c6287a6cbaa5903ee1a5934a5553e9e485d8e7
   0000000000000000000000000000000000000000 D      include/asm-ppc/termios.h

Notice how the the fact that include/asm-ppc64/termios.h is deleted gets lost?
Looks broken to me.

-Wayne
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