Documentation / technical / api-xdiff-interface.txton commit t9002: work around shells that are unable to set COLUMNS to 1 (f78b1c5)
   1xdiff interface API
   2===================
   3
   4Talk about our calling convention to xdiff library, including
   5xdiff_emit_consume_fn.
   6
   7(Dscho, JC)