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- Implement watch_input_devices in input_server, as it was TODO. For now, only one watcher is allowed at a time. - Use it in Input preferences to get notified about added and removed devices and update the device list accordingly. Change-Id: I52018af53738e68271d6d63b5bea31fd7cab1b3b Reviewed-on: https://review.haiku-os.org/c/haiku/+/2041 Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>