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 EDITOR_SINGLE_LINE_COMMENT_COLOR= IJavaColorConstants.JAVA_SINGLE_LINE_COMMENT;
	/**
	 * A named preference that controls whether single line comments are rendered in bold.
	 * <p>
	 * Value is of type <code>Boolean</code>. If <code>true</code> single line comments are rendered
	 * in bold. If <code>false</code> the are rendered using no font style attribute.
	 * </p>
	 */
	public final static String EDITOR_SINGLE_LINE_COMMENT_BOLD= IJavaColorConstants.JAVA_SINGLE_LINE_COMMENT + EDITOR_BOLD_SUFFIX; 
	/**
	 * A named preference that controls whether single line comments are rendered in italic.
	 * <p>
	 * Value is of type <code>Boolean</code>. If <code>true</code> single line comments are rendered
	 * in italic. If <code>false</code> the are rendered using no italic font style attribute.
	 * </p>
	 * 
	 * @since 3.0
	 */
	public final static String EDITOR_SINGLE_LINE_COMMENT_ITALIC= IJavaColorConstants.JAVA_SINGLE_LINE_COMMENT + EDITOR_ITALIC_SUFFIX;
	
	/**
	 * A named preference that controls whether single line comments are rendered in strikethrough.
	 * <p>
	 * Value is of type <code>Boolean</code>. If <code>true</code> single line comments are rendered
	 * in strikethrough. If <code>false</code> the are rendered using no italic font style attribute.
	 * </p>
	 * 
	 * @since 3.1
	 */
	public final static String EDITOR_SINGLE_LINE_COMMENT_STRIKETHROUGH= IJavaColorConstants.JAVA_SINGLE_LINE_COMMENT + EDITOR_STRIKETHROUGH_SUFFIX;