Comment 2 for bug 1851557

Scenario 5: When "See own groups only" is turned on along isolated institutions, regular users should only be able to invite people who are also in at least one of the groups they are in. Institution admins and staff can see everyone in their institution.

To replicate scenario 5:

1. Allow isolated institutions in the config.php.
2. In Admin menu -> Configure site -> Site options -> Group settings -> Turn on "See own groups only".
3. In In Admin menu -> Configure site -> Site options -> Group settings -> Allow everyone to create a group.
4. Set up 2 institutions with 4 people each.
5. Put two group members from one institution into the same group, and 1 each into a separate group.
6. Log in as a normal institution member and create an open group.
7. Click the "Members" tab and invite people.
Expected result: You only see the one person who is already in a group with you, but nobody else.
Actual result: You see everyone in your institution (but not people from other institutions, which is correct).