dav_svn__update_report and resource-walk

In tightening up the operational logging, I've encountered
another mystery. dav_svn__update_report looks for
"resource-walk" from the client, but I'm not really sure what
that causes it to do. It doesn't really matter, though, as serf
*never* sends this and neon has code in fetch.c:make_reporter to
send it, but no make_reporter calls use it!

It was added over 5 years ago:

------------------------------------------------------------------------
r2680 | cmpilato | 2002-07-24 11:43:27 -0700 (Wed, 24 Jul 2002) | 28 lines

Create a do_diff() RA layer vtable function.

* subversion/libsvn_ra_dav/ra_dav.h
  (svn_ra_dav__do_diff): New.

* subversion/mod_dav_svn/update.c
  (dav_svn__update_report): Support new 'resource_walk' attribute.

* subversion/libsvn_ra_dav/fetch.c
  (make_reporter): Add 'resource_walk' argument.
  (svn_ra_dav__do_update, svn_ra_dav__do_status,
    svn_ra_dav__do_switch): Update calls to make_reporter().
  (svn_ra_dav__do_diff): New.

* subversion/libsvn_ra_dav/session.c
  (dav_plugin): Add reference to svn_ra_dav__do_diff.

* subversion/include/svn_ra.h
  (svn_ra_plugin_t): Add do_diff() vtable entry.

* subversion/libsvn_ra_local/ra_plugin.c
  (make_reporter, svn_ra_local__do_diff): New.
  (svn_ra_local__do_update, svn_ra_local__do_switch,
    svn_ra_local__do_status): Use new make_reporter() helper.
  (ra_local_plugin): Add reference to svn_ra_local__do_diff.

* subversion/libsvn_client/diff.c
  (do_merge, do_diff): Use new RA->do_diff() instead of RA->do_switch().
------------------------------------------------------------------------

Unless I'm dense, I see no explanation in that log message of
what this resource-walk is supposed to do. As far as I can tell,
this code is completely dead. Well, except for pre-1.2 clients,
I guess?

Thanks.

-- 
Eric Gillespie <*> epg@pretzelnet.org
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