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Repository units that are implicitly opened are closed by timeout (10 sec. by default). When closing them by timeout, an empty list is passed as required units parameter. This is incorrect. I believe the fix is to have a special call that mean "leave the required units list as it"
No user-visible consequences were noticed, so I leave it as P3.
The code that does this is in o.n.m.c.modelimpl.repository.RepositoryListenerImpl
Fixed: http://hg.netbeans.org/main/rev/dadb219c105b