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
return preferenceName;
    }
    /**
     * Returns the preference page in which this field editor
     * appears.
     *
     * @return the preference page, or <code>null</code> if none
     */
    protected PreferencePage getPreferencePage() {
        return page;
    }
    /**
     * Returns the preference store used by this field editor.
     *
     * @return the preference store, or <code>null</code> if none
     * @see #setPreferenceStore
     */
    public IPreferenceStore getPreferenceStore() {
        return preferenceStore;
    }
    /**
     * Initialize the field editor with the given preference name and label.
     * 
     * @param name the name of the preference this field editor works on
     * @param text the label text of the field editor
     */
    protected void init(String name, String text) {
        Assert.isNotNull(name);
        Assert.isNotNull(text);
        preferenceName = name;