Parallel checkout within checkout

Hi,

I am trying to find out if some new behavior we see with version 1.7 is
considered a bug (I would).

What we try to do is assembling a larger piece of software from tens or
hundreds of repositories. In that, checkouts might also live within
checkouts of other svn repositories. We usually checkout these in
parallel, but because the contained checkout isn't using a subdirectory
name that would be part of the containing repository, this wasn't a
problem in the past.

However, version 1.7 seems to change this. Trying to checkout the
contained repository while the containing repository isn't finished yet
(parallel checkout) produces errors like

svn: E155037: Previous operation has not finished; run 'cleanup' if it
was interrupted

My theory is that the checkout of the contained repository tries to look
into .svn of the containing repository, and finds it 'currently used'.
This was not the case for versions <1.7, maybe because these didn't use
a 'central' .svn directory.

I would now argue that this is a regression, since svn <1.7 worked fine
in this scenario, while >=1.7 doesn't.

Ways to reproduce:

1. svn co some_repo
2. interrupt during checkout (control-Z)
3. cd into new (partial) checkout
4. svn co some_other_repo

thanks, Frank Loeffler