Connectors don't get removed properties in changes/delta

When property has been removed from node and then changes must be saved to external source they are not available in connector's updateDocument(delta) method.

class org.modeshape.jcr.cache.document.SessionNode.java has following code which returns change list for removed properties:

        public Set<Name> removedPropertyNames() {
            Set<Name> result = new HashSet<Name>();
            result.addAll(changedProperties().keySet());
            return result;
        }

instead of

result.addAll(changedProperties().keySet()) 

there should be

result.addAll(removedProperties())