Move 'unpack_trees()' over to 'traverse_trees()' interface
This not only deletes more code than it adds, it gets rid of a singularly hard-to-understand function (unpack_trees_rec()), and replaces it with a set of smaller and simpler functions that use the generic tree traversal mechanism to walk over one or more git trees in parallel. It's still not the most wonderful interface, and by no means is the new code easy to understand either, but it's at least a bit less opaque. Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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