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Enabling the RawInput backend causes SDL_XINPUT_Enabled() to return false. That causes WGI and DInput backends to take ownership of XInput-compatible controllers, because they think there's no XInput-specific backend enabled. In WGI's case, it will actually race with RawInput to open the device. By properly excluding XInput devices from WGI, we can ensure that the sets of devices managed by WGI and RawInput don't intersect. This makes the race harmless, since they'll never both go after the same device.