When you duplicate a module role it will be added to all Userroles which have the original module role.
I highly doubt if this is preferable for anyone, but anyways it would be great if you had an option to duplicate the role without adding it to any existing userroles.
Just kicking my own old idea to the top.
When you duplicate a module role it will still add it to the UserRoles where the original is already used. When I duplicate a module role it is because I want to easy create a new module role which is slightly different from the original. This new module role is different than the original, I do not want this to be automatically added to user roles which have the original module role.
I really cannot think of a case where you would want this existing behavior. Now I have to manually remove the newly duplicated module role from all the Userroles where the original is used. This is very error prone and could easily lead to giving users to much rights if you miss one.
Please remove this behavior when duplicating module roles.