Advanced search does not work when adding a coached group.
How to reproduce (OO test 7):
- Log in as a user who is coach/owner of a course and a coach of several groups.
- Open the course and go to members management.
- Klick on "Add group" button.
- Under the tab "Coached" open "Advanced search" and type in one of the available groups.
=> NOK: Nothing happens, it still shows the complete list of all groups coached by this user (see attached screenshot).
=> Expected behaviour: "Advanced search" under the tab "Coached" should show the requested group, just like under the tab "Search".