Historically, backups of an activity using questions would include all
questions for the entire context, where any question had been used. This
could lead to very large backup files, and exacerbated problems with
question duplication.
This changes the process for annotating categories to include in the
backup to find specific categories, rather than whole contexts. It
includes 3 groups of categories:
1. Those that belong to the backed up activity's context.
2. Those that contain a question used directly in a question_reference
belonging to the activity.
3. Those that contain a question used via a question_set_reference
belonging to the activity.
It also adds in any parent categories that are not included by the
above, so we have a complete hierarchy.
For group 1, the backup will include all questions belonging to these
categories, as before. For groups 2 and 3, it will only include
questions for question bank entries that have been annotated by the
activity.
Mark Johnson
006568435d