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
* The resulting array must not be modified,
 * as it may come directly from the model's internal state.
 *
 * @param parent the parent element
 * @return a filtered array of child elements
 */
protected Object[] getFilteredChildren(Object parent) {
	Object[] result = getRawChildren(parent);
	if (filters != null) {
		for (Iterator iter = filters.iterator(); iter.hasNext();) {
			ViewerFilter f = (ViewerFilter) iter.next();
			result = f.filter(this, parent, result);
		}
	}
	return result;
}
/**
 * Returns this viewer's filters.
 *
 * @return an array of viewer filters
 */
public ViewerFilter[] getFilters() {
	if (filters == null)
		return new ViewerFilter[0];
	ViewerFilter[] result = new ViewerFilter[filters.size()];
	filters.toArray(result);
	return result;
}
/**
 * Returns the item at the given display-relative coordinates, or