Bug 73027 [Dialogs] Buttons are too high
I20040831 Buttons are no longer oval but have a rounded rectangle shape (see first screenshot). The second screenshot shows how buttons using the small system font should look like.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/FontFieldEditor.java
changeFontButton.addDisposeListener(new DisposeListener() {
                public void widgetDisposed(DisposeEvent event) {
                    changeFontButton = null;
                }
            });
            changeFontButton.setFont(parent.getFont());
            setButtonLayoutData(changeFontButton);
        } else {
            checkParent(changeFontButton, parent);
        }
        return changeFontButton;
    }
    /* (non-Javadoc)
     * Method declared on FieldEditor.
     */
    public int getNumberOfControls() {
        if (previewer == null)
            return 3;
        else
            return 4;
    }
    /**
     * Returns the preferred preview height. 
     *
     * @return the height, or <code>-1</code> if no previewer
     *  is installed
     */
    public int getPreferredPreviewHeight() {
        if (previewer == null)
            return -1;