reopening directories in the commit editor

Is the following sequence valid when driving a commit editor:

   open_root
   add_directory "zig"
   close_directory "zig"
   open_directory "zig"

i.e. reopening a directory already added in the transaction. I ask
because it works over ra_local and ra_svn but fails over ra_dav with
the error

../svn/subversion/libsvn_ra_dav/util.c:780: (apr_err=175007)
svn: PROPFIND request failed on '/tests/repo/!svn/bc/5/zig'
../svn/subversion/libsvn_ra_dav/util.c:728: (apr_err=175007)
svn: '/tests/repo/!svn/bc/5/zig' path not found

If I use svnlook to examine the transaction the directory "zig" is
present.

-- 
Philip Martin
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