[PATCH v2 0/2] MR5323: win32u: Key auto-repeat improvements.

[Alexandros Frantzis (＠afrantzis)]

A couple of win32u auto-repeat related improvements:

1. Cancel auto-repeat only if the repeat key is released (not other keys).
2. Cancel previous key auto-repeat when starting a new one for a different window (see commit message for more info).

I have kept the changes minimal, which can lead to a few extraneous `kill_system_timer` calls. To improve on this would require more extensive tracking/clearing of `thread_info->key_repeat_msg`.

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  v2: win32u: Cancel previous key auto-repeat when starting a new one.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/5323