Re matching an opponent while in a queue can lead to multiple matches at once.

[twisterjafla]

Re matching a previous opponent does not remove players from queue. This can lead to them finding another match while the rematch is in progress.

Steps to reproduce.

1. queue and play a game
2. requeue
3. Then rematch the first game
4. Wait

Once a queued match is found there will be two active matches at once.