Bug 305703 [Viewers][CommonNavigator] remembered contributions can leak when using filters
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
}
		}
	}
	/**
	 * Refreshes the tree starting at the given widget.
	 * <p>
	 * EXPERIMENTAL. Not to be used except by JDT. This method was added to
	 * support JDT's explorations into grouping by working sets. This method
	 * cannot be removed without breaking binary backwards compatibility, but
	 * should not be called by clients.
	 * </p>
	 *
	 * @param widget
	 *            the widget
	 * @param element
	 *            the element
	 * @param doStruct
	 *            <code>true</code> if structural changes are to be picked up,
	 *            and <code>false</code> if only label provider changes are of
	 *            interest
	 * @param updateLabels
	 *            <code>true</code> to update labels for existing elements,
	 *            <code>false</code> to only update labels as needed, assuming
	 *            that labels for existing elements are unchanged.
	 * @since 3.1
	 */
	protected void internalRefresh(Widget widget, Object element,
			boolean doStruct, boolean updateLabels) {
		if (widget instanceof Item) {
			if (doStruct) {