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
* A string value used by the named preference <code>REFACTOR_ERROR_PAGE_SEVERITY_THRESHOLD</code>.
	 * 
	 * @see #REFACTOR_ERROR_PAGE_SEVERITY_THRESHOLD
	 * @deprecated Use constant {@link org.eclipse.ltk.core.refactoring.RefactoringStatus#OK} 
	 */
	public static final String REFACTOR_OK_SEVERITY= "0"; 
	/**
	 * A named preference that controls whether all dirty editors are automatically saved before a refactoring is
	 * executed.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 */
	public static final String REFACTOR_SAVE_ALL_EDITORS= "Refactoring.savealleditors"; 
	
	/**
	 * A named preference that controls a reduced search menu is used in the Java editors.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 * @since 3.0
	 */
	public static final String SEARCH_USE_REDUCED_MENU= "Search.usereducemenu"; 
	/**
	 * A named preference that controls if the Java Browsing views are linked to the active editor.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 * 
	 * @see #LINK_PACKAGES_TO_EDITOR