This is an early draft of an implementation of key auto-repeat in wineserver to get some feedback. Some open questions:
1. queue_keyboard_message requires a `current` thread, but we don't get one in timeout callbacks. At the moment I am manually setting `current` to the foreground thread, but I am wondering if that's acceptable or we should explore other ways forward (also see TODO in code).
2. This draft introduces a new server request to configure auto-repeat (`enable/delay/period`). I am thinking that for more straightforward integration with the keyboard repeat SPI parameters, the request should only support the `enable` flag and the server should query the SPI registry values to get `delay` and `period` when needed. I am wondering if there any caveats here since I don't see other code in the server querying registry values (well, except to implement the registry requests themselves). Also, I would hope that opening and caching the `HKCU\Control Panel\Keyboard` hkey would remove most of the cost of performing this operation (if that's even a concern at all).
-- v5: win32u: Implement keyboard auto-repeat using new server request. server: Implement key auto-repeat request.