The following test fails:


    @Test public void showMnemonicsOfLabelIsSetToFalseWhenLabelForIsCleared() {
        TextField textField = new TextField();
        textField.impl_setShowMnemonics(true);
        label.setLabelFor(textField);
        label.setLabelFor(null);
        assertTrue(textField.impl_isShowMnemonics());
        assertFalse(label.impl_isShowMnemonics());
    }