Not all commits are done in the presence of a
working copy; therefore, after the client sends a
final MERGE request, it's often wasteful to for
mod_dav_svn to send humongous merge-responses full
of vsn-rsc-urls.
In particular, it kind of ruins the "constant time
tagging" feature when you run 'svn cp URL URL'.
Understandably, if I did the copy in my wc and
committed, the tag couldn't possibly be
constant-time; but 'svn cp URL URL' should
definitely be constant time.
One idea is to send some kind of custom header in
the MERGE request that means, "please send minimal
response."
Minor SVN-981 tree copies can be O(N) when copyfrom args not used
