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
* @since 3.0
	 */
	public final static String SPELLING_ENABLE_CONTENTASSIST= ISpellCheckPreferenceKeys.SPELLING_ENABLE_CONTENTASSIST;
	/**
	 * A named preference that controls whether code snippets are formatted
	 * in Javadoc comments.
	 * <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_SOURCE}
	 */	
	public final static String FORMATTER_COMMENT_FORMATSOURCE= "comment_format_source_code"; 
	
	/**
	 * A named preference that controls whether description of Javadoc
	 * parameters are indented.
	 * <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_INDENT_PARAMETER_DESCRIPTION}
	 */	
	public final static String FORMATTER_COMMENT_INDENTPARAMETERDESCRIPTION= "comment_indent_parameter_description"; 
	/**
	 * A named preference that controls whether the header comment of
	 * a Java source file is formatted.
	 * <p>