Bug 117071 MembersOrderPreferenceCache leaking a propertyChangeListener
20051109 org.eclipse.jdt.ui.PreferenceConstants#initializeDefaultValues adds a listener to JDT UI preference store but this is not deleted before shutdown.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferenceConstants.java
* <p>
	 * Value is of type <code>Boolean</code>:<code>true</code> if enabled.
	 * </p>
	 * 
	 * @since 3.0
	 * @deprecated As of 3.1, this preference is not used or set any longer; see
	 *             {@link SemanticHighlightings#affectsEnablement(IPreferenceStore, org.eclipse.jface.util.PropertyChangeEvent)}
	 */
	public static final String EDITOR_SEMANTIC_HIGHLIGHTING_ENABLED=EDITOR_SEMANTIC_HIGHLIGHTING_PREFIX + "enabled"; 
	
	/**
	 * A named preference suffix that controls a semantic highlighting's color.
	 * <p>
	 * Value is of type <code>String</code>. A RGB color value encoded as a string
	 * using class <code>PreferenceConverter</code>
	 * </p>
	 * 
	 * @see org.eclipse.jface.resource.StringConverter
	 * @see org.eclipse.jface.preference.PreferenceConverter
	 * @since 3.0
	 */
	public static final String EDITOR_SEMANTIC_HIGHLIGHTING_COLOR_SUFFIX=".color"; 
	/**
	 * A named preference suffix that controls if semantic highlighting has the text attribute bold.
	 * <p>
	 * Value is of type <code>Boolean</code>: <code>true</code> if bold.
	 * </p>
	 * 
	 * @since 3.0
	 */