code: func (v *Clipboard) WaitForText() (string, error) {
  	c := C.gtk_clipboard_wait_for_text(v.native())
  	if c == nil {
  		return "", nilPtrErr
  	}
  	defer C.g_free(C.gpointer(c))
  	return goString(c), nil
  }
docs: // WaitForText is a wrapper around gtk_clipboard_wait_for_text