copies: fix detection of divergent directory renames
If we move all the files out of one directory, but into two different
directories, we should not consider it a directory rename. The
detection of this case was broken.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
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