Admin can change user1 name to the same name user2 has

[guttih]

User names should be unique!

When admin is logged on and is changing the user's properties.

Let's say user A has the user name "older" and user B has the user name "newer"

An admin can goto:

1. menu->users->List users
2. click edit for user B
3. change the user name to older
4. save

By doing this two users will have the username older which will probably result in that user B can not log on anymore.

The solution is that before saving user changes the server will search if any other user has this username and different id. If another user has the same user name, the server will not allow the saving to take place and report to why the save did not take place.