Sparse directories unbackwardly compatible over ra_dav

Hi all,

I haven't got time to look into this at the moment, but I thought I'd
post to the list in case someone else does (or in case it is/was a known
problem at the moment).

It appears that the sparse-directory protocol changes aren't backward
compatible; attempts to checkout or update from a 1.4.3 (e.g.) client
against a trunk server (r25053) give something like:

 svn: REPORT request failed on '/foo/!svn/vcc/default'
 svn: Unsupported report depth 'unknown'

Regards,
Malcolm