Added some FIXMEs.

src/joystick/windows/SDL_dxjoystick.c

@@ -1448,13 +1448,15 @@ SDL_SYS_JoystickUpdate_XInput(SDL_Joystick * joystick)
         XINPUT_STATE_EX *pXInputState = &joystick->hwdata->XInputState[joystick->hwdata->currentXInputSlot];
         XINPUT_STATE_EX *pXInputStatePrev = &joystick->hwdata->XInputState[joystick->hwdata->currentXInputSlot ^ 1];
 
+        /* !!! FIXME: why isn't this just using SDL_PrivateJoystickAxis_Int()? */
         SDL_PrivateJoystickAxis( joystick, 0, (Sint16)pXInputState->Gamepad.sThumbLX );
         SDL_PrivateJoystickAxis( joystick, 1, (Sint16)(-SDL_max(-32767, pXInputState->Gamepad.sThumbLY)) );
         SDL_PrivateJoystickAxis( joystick, 2, (Sint16)pXInputState->Gamepad.sThumbRX );
         SDL_PrivateJoystickAxis( joystick, 3, (Sint16)(-SDL_max(-32767, pXInputState->Gamepad.sThumbRY)) );
         SDL_PrivateJoystickAxis( joystick, 4, (Sint16)(((int)pXInputState->Gamepad.bLeftTrigger*65535/255) - 32768));
         SDL_PrivateJoystickAxis( joystick, 5, (Sint16)(((int)pXInputState->Gamepad.bRightTrigger*65535/255) - 32768));
 
+        /* !!! FIXME: why isn't this just using SDL_PrivateJoystickButton_Int(), instead of keeping these two alternating state buffers? */
         if ( ButtonChanged( pXInputState->Gamepad.wButtons, pXInputStatePrev->Gamepad.wButtons, XINPUT_GAMEPAD_DPAD_UP ) )
             SDL_PrivateJoystickButton(joystick, 0, pXInputState->Gamepad.wButtons & XINPUT_GAMEPAD_DPAD_UP ? SDL_PRESSED :  SDL_RELEASED );
         if ( ButtonChanged( pXInputState->Gamepad.wButtons, pXInputStatePrev->Gamepad.wButtons, XINPUT_GAMEPAD_DPAD_DOWN ) )