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11cf04eed1
The way spectator currently works, the `Spectator` screen is responsible for adding new frames to the replay, even when it has a child (`SpectatorPlayer`) present. There was a possibility that a new play had already started, and on returning to the Spectator screen (to initialise the new play) there would be a brief period where the Player instance is still reading from the replay, the `userBeganPlaying` call had not yet finished initialising the new target replay, and `userSentFrames` is run (asynchronously), writing frames to the previous replay using the incorrect ruleset instance). To make this work, it doesn't `Schedule` frame addition to the replay (making things a bit unsafe). Changing this itself isn't such a simple one to do, so I instead opted to fix this via locking. Closes https://github.com/ppy/osu/issues/10777.