Wrong vertical alignment when TextField is aligned MIDDLE_CENTER

[amahdy]

The 'x' button is not well positioned vertically if I use this code:

    @Override
    protected void init(VaadinRequest vaadinRequest) {
        final VerticalLayout layout = new VerticalLayout();
        setContent(layout);

        final TextField tf = new TextField();
        ResetButtonForTextField.extend(tf);

        layout.addComponent(tf);
        layout.setComponentAlignment(tf, Alignment.MIDDLE_CENTER);

    }