[WIP] Fix for issue 2333 (repos-repos diff skips deleted dirs)

Hi folks,

here's a work in progress for fixing a long-standing diff bug.

  "'svn diff URL1 URL2' not reverse of 'svn diff URL2 URL1'"
  http://subversion.tigris.org/issues/show_bug.cgi?id=2333

The basic approach was suggested by cmpilato in a comment
to the issue. In repos_diff.c:delete_entry(), I call svn_client_list2(),
handing it a callback that prints diffs for all files in the "old"
tree. It's a bit awkward to call a client API function in repos_diff,
whose edit_baton was never yet sullied by an svn_client_ctx_t.

The ugliest hack (so far) is in diff_deleted_dir_cb(), the callback.
I need to hand get_file_from_ra() a path relative to the RA
session's URL.

TODOs include:

Find out why diff_tests.py 28 still fails.

Investigate other failing diff tests.

Include dir diffs in the list2-callback.

Handle authz failures gracefully.

Anything else?

Comments welcome.

Steve

--
Stephen Butler | Senior Consultant
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