On the subtree-mergeinfo branch: Don't set non-inheritable mergeinfo unless it is really necessary.
On the subtree-mergeinfo branch: Don't set non-inheritable mergeinfo unless
it is really necessary.

* subversion/libsvn_client/merge.c
  (do_directory_merge): Don't set non-inheritable mergeinfo to describe an
  inoperative merge.


git-svn-id: 9641cf3ee320c79489e889e18ede4f7f3a694a10@877055 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion