use descendantsproxy + collectionfilter instead of invisiblecollecitonfetch as workaround
use descendantsproxy + collectionfilter instead of invisiblecollecitonfetch as workaround

sandsmark/zanshin,kolab-groupware/zanshin,sandsmark/zanshin,sandsmark/zanshin,kolab-groupware/zanshin,kolab-groupware/zanshin