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_TASK_TAG_COLOR= IJavaColorConstants.TASK_TAG;
	/**
	 * A named preference that controls whether task tags are rendered in bold.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 * @since 2.1
	 */
	public final static String EDITOR_TASK_TAG_BOLD= IJavaColorConstants.TASK_TAG + EDITOR_BOLD_SUFFIX;
	/**
	 * A named preference that controls whether task tags are rendered in italic.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 * 
	 * @since 3.0
	 */
	public final static String EDITOR_TASK_TAG_ITALIC= IJavaColorConstants.TASK_TAG + EDITOR_ITALIC_SUFFIX;
	/**
	 * A named preference that controls whether task tags are rendered in strikethrough.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 * 
	 * @since 3.1
	 */
	public final static String EDITOR_TASK_TAG_STRIKETHROUGH= IJavaColorConstants.TASK_TAG + EDITOR_STRIKETHROUGH_SUFFIX;
	
	/**
	 * A named preference that controls whether task tags are rendered in underline.