Documentation / technical / api-xdiff-interface.txton commit unpack_trees: fix breakage when o->src_index != o->dst_index (7db1183)
   1xdiff interface API
   2===================
   3
   4Talk about our calling convention to xdiff library, including
   5xdiff_emit_consume_fn.
   6
   7(Dscho, JC)