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dea7f2308c
If a user leave and then rejoins a multiplayer match while another user is not at the lobby screen, there is a potential the `ParticipantPanel` tracking the user will not correctly be recreated to reference the new instance of the `MultiplayerUser`. This happens because the `OnRoomUpdated` call is scheduled, which means it is not running in the background, coupled with the local logic that relies on `IEquatable(MultiplayerRoomUser)` (which in turn falls back to a UserID comparison). Changing this to a reference comparison is the easiest way to resolve this. Whether we change the `IEquatable` implementation is up for discussion. Closes https://github.com/ppy/osu/issues/15970.