[PATCH v2 0/2] pack-objects: more brown-paper-bag multi-pack reuse fixes

This is a small re-roll of my series to fix a regression in multi-pack reuse based on a broken assumption in write_reused_pack_verbatim().

The only change since last time is removing a stray debugging aid, and the series is otherwise identical as in v1. A range-diff is included below for convenience.

Thanks in advance for your review!

Taylor Blau (2):
  t5332-multi-pack-reuse.sh: demonstrate duplicate packing failure
  pack-objects: only perform verbatim reuse on the preferred pack

 builtin/pack-objects.c      | 101 +++++++++++++++---------------------
 t/t5332-multi-pack-reuse.sh |  22 ++++++++
 2 files changed, 65 insertions(+), 58 deletions(-)

Range-diff against v1:
1:  7a69cf84ae5 ! 1:  d791b7b20c9 t5332-multi-pack-reuse.sh: demonstrate duplicate packing failure
    @@ t/t5332-multi-pack-reuse.sh: test_expect_success 'duplicate objects' '
     +
     +		# ...and create a separate pack containing just that object
     +		p="$(git pack-objects $packdir/pack <in)" &&
    -+		git show-index <$packdir/pack-$p.idx &&
     +
     +		git multi-pack-index write --bitmap --preferred-pack=pack-$p.idx &&
     +
2:  2520abf24a8 = 2:  d73b8fe2d63 pack-objects: only perform verbatim reuse on the preferred pack

base-commit: 25b0f41288718625b18495de23cc066394c09a92