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/StringButtonFieldEditor.java
*/
    private String changeButtonText;
    /**
     * Creates a new string button field editor 
     */
    protected StringButtonFieldEditor() {
    }
    /**
     * Creates a string button field editor.
     * 
     * @param name the name of the preference this field editor works on
     * @param labelText the label text of the field editor
     * @param parent the parent of the field editor's control
     */
    protected StringButtonFieldEditor(String name, String labelText,
            Composite parent) {
        init(name, labelText);
        createControl(parent);
    }
    /* (non-Javadoc)
     * Method declared on FieldEditor.
     */
    protected void adjustForNumColumns(int numColumns) {
        ((GridData) getTextControl().getLayoutData()).horizontalSpan = numColumns - 2;
    }
    /**
     * Notifies that this field editor's change button has been pressed.
     * <p>
     * Subclasses must implement this method to provide a corresponding
     * new string for the text field. If the returned value is <code>null</code>,