// private gtk_timeout_add result for mimicing wxUSER_ATTENTION_INFO and
// wxUSER_ATTENTION_ERROR difference, -2 for no hint, -1 for ERROR hint, rest for GtkTimeout handle.
// private gtk_timeout_add result for mimicing wxUSER_ATTENTION_INFO and
// wxUSER_ATTENTION_ERROR difference, -2 for no hint, -1 for ERROR hint, rest for GtkTimeout handle.