By default, the Group module ignores the hierarchical nature of book pages: when a book is added as group content to a group, none of its child pages are added. As a result adding a book to a group is long, boring task.
This module changes that by adding the following behaviour:
- When a top level book is added to a group as group content, all child pages are added as well.
- When a top level book is removed from a group, all child pages are removed as well.
- When a top-level book is moved to another group, all child pages are moved as well.