* tools/dist/backport.pl: Add a TODO.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1570049 13f79535-47bb-0310-9956-ffa450edef68
Now that diff can produce proper revisions in all cases, stop producing
invalid revision numbers in the informational only parts of diff headers.

We used to produce 'revision 0' as old revision on additions and
the 'right revision' of the diff as right revision for deletions.
(Except for copies, and...)

These revisions are now reported as 'nonexistent'.

* subversion/libsvn_client/diff.c
  (DIFF_REVNUM_NONEXISTENT): New define.
  (diff_label): Define label for nodes that don't exist in a revision.
  (diff_driver_info_t): Remove right revision.

  (diff_file_added): Remove magic revision 0 and stray SVN_DBG().
  (diff_file_deleted): Use DIFF_REVNUM_NONEXISTENT on deleted nodes instead
    of the right revision.
  (diff_dir_added): Use DIFF_REVNUM_NONEXISTENT instead of r0.

  (diff_wc_wc,
   diff_repos_repos,
   diff_repos_wc,
   svn_client_diff6,
   svn_client_diff_peg6): Don't initialize now unused variable.

* subversion/tests/cmdline/diff_tests.py
  (diff_schedule_delete,
   diff_repos_wc_add_with_props,
   diff_repos_working_added_dir,
   diff_backward_repos_wc_copy,
   diff_git_format_wc_wc,
   diff_git_format_wc_wc_dir_mv,
   diff_git_format_url_wc,
   diff_git_format_url_url,
   diff_git_empty_files,
   diff_git_with_props,
   diff_two_working_copies,
   diff_deleted_url,
   diff_arbitrary_files_and_dirs,
   diff_dir_replaced_by_file,
   diff_move_inside_copy,
   diff_repo_repo_added_file_mime_type): Update expected results.

* subversion/tests/cmdline/log_tests.py
  (log_diff,
   log_diff_moved): Update expected result.

* subversion/tests/cmdline/merge_authz_tests.py
  (diff_unauth_parent): Update expected result.

* subversion/tests/cmdline/merge_tests.py
  (merge_in_new_file_and_diff): Update expected result.

* subversion/tests/cmdline/special_tests.py
  (diff_symlink_to_dir): Update expected result.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1570053 13f79535-47bb-0310-9956-ffa450edef68