Fix that if a child forum does not grant a viewing user the "View threads by others" permission, and it is aggregated into a parent forum which does, results in title/last post/etc information for threads (from the child forum) being unexpectedly disclosed.
This only applies if the child forum is visible to the user
This affects all version of the XF2 version of this add-on before 2.2.1
Fix compatibility with Collaborative Threads if the aggregated child forum lacks the "View threads by others" but the viewing user would not see threads that they are a collaborator on.