code: func getControlKeys(controlState uint32) (shift, alt, control bool) {
  	shift = 0 != (controlState & winterm.SHIFT_PRESSED)
  	alt = 0 != (controlState & (winterm.LEFT_ALT_PRESSED | winterm.RIGHT_ALT_PRESSED))
  	control = 0 != (controlState & (winterm.LEFT_CTRL_PRESSED | winterm.RIGHT_CTRL_PRESSED))
  	return shift, alt, control
  }
docs: // getControlKeys extracts the shift, alt, and ctrl key states.