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/FieldEditor.java
protected static final int HORIZONTAL_GAP = 8;
    /**
     * The preference store, or <code>null</code> if none.
     */
    private IPreferenceStore preferenceStore = null;
    /**
     * The name of the preference displayed in this field editor.
     */
    private String preferenceName;
    /**
     * Indicates whether the default value is currently displayed,
     * initially <code>false</code>.
     */
    private boolean isDefaultPresented = false;
    /**
     * The label's text.
     */
    private String labelText;
    /**
     * The label control.
     */
    private Label label;
    /**
     * Listener, or <code>null</code> if none
     */
    private IPropertyChangeListener propertyChangeListener;
    /** 
     * The page containing this field editor
     */
    private PreferencePage page;