The Add/Remove user selection dialog is used in a quite a few places:

• Group management
• Cohort management
• ...

It has two parts:

1. Left side : the user already present
2. Right side: the users to add

There are several noted flaws on this dialog:

• In the right side, if user emails/names are long, we cannot see the other information (for example as noted in MDL-76386 the number of group the user belongs to is an important factor in selecting the right user)
• We have only a search box based on the name. It would be nice to filter by other criteria (email, group numbers, custom fields)
• The layout is cluttered and we have done something quite better in the participant page. Why not try something a bit similar here ?