Confirm closing window when in queue

[afsa]

I suggest that a close dialog should be added (for example a JavaScript onBeforeUnload) when you try to close the browser and are in the queue. As it is now you could by mistake close your browser when you are in the queue, which is annoying.

It also causes your local client and the server to disagree if you are still in the queue. The server thinks you are in the queue (other clients see this), but your client thinks you are not.