Documentation / technical / api-xdiff-interface.txton commit setup: split off $GIT_DIR-set case from setup_git_directory_gently (e4e3034)
   1xdiff interface API
   2===================
   3
   4Talk about our calling convention to xdiff library, including
   5xdiff_emit_consume_fn.
   6
   7(Dscho, JC)