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
*/	
	public final static String FORMATTER_COMMENT_CLEARBLANKLINES= "comment_clear_blank_lines"; 
	/**
	 * A named preference that controls the line length of comments.
	 * <p>
	 * Value is of type <code>Integer</code>. The value must be at least 4 for reasonable formatting.
	 * </p>
	 *
	 * @since 3.0
	 * @deprecated As of 3.1, replaced by {@link org.eclipse.jdt.core.formatter.DefaultCodeFormatterConstants#FORMATTER_COMMENT_LINE_LENGTH}
	 */	
	public final static String FORMATTER_COMMENT_LINELENGTH= "comment_line_length"; 
	/**
	 * A named preference that controls whether HTML tags are formatted.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 *
	 * @since 3.0
	 * @deprecated As of 3.1, replaced by {@link org.eclipse.jdt.core.formatter.DefaultCodeFormatterConstants#FORMATTER_COMMENT_FORMAT_HTML}
	 */	
	public final static String FORMATTER_COMMENT_FORMATHTML= "comment_format_html"; 
	/**
	 * A named preference that controls if the Java code assist gets auto activated.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 */
	public final static String CODEASSIST_AUTOACTIVATION= "content_assist_autoactivation"; 
	/**