-[COEditingContext deletedPersistentRoots] doesn't return persistent roots marked deleted

[ericwa]

When you create a new COEditingContext and call -deletedPersistentRoots, it doesn't return those persistent roots marked deleted on disk. This is contrary to the docs for -deletedPersistentRoots which say:

/**
 * Returns persistent roots marked as deleted on disk, excluding those that
 * are pending undeletion, plus those pending deletion.
 */
@property (nonatomic, readonly) NSSet *deletedPersistentRoots;

The problem is -initWithStore:modelDescriptionRepository: calls [_store persistentRootUUIDs], which only returns non-deleted UUIDs.

This is the cause of the test failure in TestCrossPersistentRootReferences.m, -testLibraryPersistentRootUndeletion, the // FIXME: Currently fails for the isNewContext==NO case comment.