Add server-side support for slots in multiplayer rooms#513
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May 24, 2026
Fell out of full-stack testing with ppy/osu-server-spectator#513. - **Fix missing property copy in multiplayer client** Would cause the participant count limit to not update on the multiplayer match screen. - **Fix hard crash when user is kicked from a room with slots active** The kicked user is unsubscribed from receiving room state updates before their slot is vacated, which then would lead this code to attempt to look the local, kicked user via the unvacated slot and thus fail because `client.Room.Users` does *not* contain the user anymore. This is a bit of a dicey change but I think it's less dicey than to try to wiggle ordering server-side.
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This includes:
The best specification for how the slots were intended to work is probably the test suite added here (
MaxParticipantsAndSlotsTest) so I'd rather recommend reading that instead than restate the tests here.