Moving items to hotbar via hotkeys desyncs

[ScribbleTAS]

Found by PoyoSquared:

It seems that there's a bug where the inventory operation to move an item to the hotbar while recording doesn't work when replaying.
To be precise, this is probably because it takes time to execute only when replaying

When recording, it takes 1tick to move an item to the specified hotbar, but when replaying, it takes 4tick. If you close the inventory before the time has elapsed, the item move will fail...

While investigating that, I found that moving items sometimes selects the wrong item to move... Specifically, the item that is moved is the one that is hovered over at the end of the tick. Seems that my fix to #251 has caused this now to fail

Desync-Hotbar.mp4