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
* of code assist proposal.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 */
	public final static String CODEASSIST_FILL_ARGUMENT_NAMES= "content_assist_fill_method_arguments"; 
	/**
	 * A named preference that controls if method arguments are guessed when a
	 * method is selected from as list of code assist proposal.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 * @since 2.1
	 */
	public final static String CODEASSIST_GUESS_METHOD_ARGUMENTS= "content_assist_guess_method_arguments"; 
	/**
	 * A named preference that holds the characters that auto activate code assist in Java code.
	 * <p>
	 * Value is of type <code>String</code>. All characters that trigger auto code assist in Java code.
	 * </p>
	 */
	public final static String CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA= "content_assist_autoactivation_triggers_java"; 
	/**
	 * A named preference that holds the characters that auto activate code assist in Javadoc.
	 * <p>
	 * Value is of type <code>String</code>. All characters that trigger auto code assist in Javadoc.
	 * </p>
	 */
	public final static String CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC= "content_assist_autoactivation_triggers_javadoc"; 
	/**