Ralf Schlatterbeck authored Feb 17, 2014 and Eric S. Raymond committed Feb 18, 2014

The absorbed repository is already uniquified. So renumbering will put
the absorbed repo back into the mark-namespace of the absorbing repo.
Even if the absorbing repo would be correctly renumbered (this is
currently no precondition) the renumbering has an off-by-one error.
The new graft2 test shows the behaviour. With the old code we end up
with a parent reference to a blob. Bad.

Signed-off-by: Eric S. Raymond <esr@thyrsus.com>