Bug 30751 [Viewers] Closing all projects doesnt clear package browser list [browsing]
In the java browsing perspective, if you close all projects, the packages browser still has a list of all the packages from the last opened project.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
* @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 2.0
 */
protected void internalRefresh(Object element, boolean updateLabels) {
	internalRefresh(element);
}
/**
 * Adds the element item pair to the element map
 * <p>
 * This method is internal to the framework; subclassers should not call
 * this method.
 * </p>
 *
 * @param element the element
 * @param item the corresponding widget
 */
protected void mapElement(Object element, Widget item) {
	if (elementMap != null)
		elementMap.put(element, item);
}
/**
 * Determines whether a change to the given property of the given element
 * would require refiltering and/or resorting.
 * <p>
 * This method is internal to the framework; subclassers should not call
 * this method.
 * </p>