Sign-up: Improve the 'available to' field behavior for long lists

When modifying a Sign-up list, you have the possibility to make it available to other sites and their sections too. When faculty are member of many worksites with many sections each you must scroll a veeeeeeeery long list to get to the bottom so you can edit the timeslots.

The idea would be to use a component (i.e. bootstrap multi-select like it’s done on Assignments) to ease this task.

Open