Documentation / technical / api-xdiff-interface.txton commit setup.c: detect $GIT_COMMON_DIR in is_git_directory() (4dc4e14)
   1xdiff interface API
   2===================
   3
   4Talk about our calling convention to xdiff library, including
   5xdiff_emit_consume_fn.
   6
   7(Dscho, JC)