kuser cannot perform tasks on multiple users together

Binary package hint: kdeadmin

To reproduce:
Launch kuser. Now create some users. For example, I created 4 users test1 to test 4.
Now select all the 4 users by Ctrl+Clicking on each.
Now press the Delete user button. The delete operation will be performed on only one of the users, which is test4 in my case. After test4 is removed, we are left with test1 to test3 users left back and selected. We can click on Delete again to remove test3 and so on.

This bothers me as I often have to set up many users or remove a chunk of them. Often when the number of users are removed serially, ie, in my case, I often remove user1 to user80 together, which becomes tiring due to this bug.