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
public void removeFilter(ViewerFilter filter) {
	Assert.isNotNull(filter);
	if (filters != null) {
		
		for (Iterator i = filters.iterator(); i.hasNext();) {
			Object o = i.next();
			if (o == filter) {
				i.remove();
				refresh();
				if (filters.size() == 0)
					filters = null;
				return;
			}
		}
	}
}
/**
 * Discards this viewer's filters and triggers refiltering and resorting
 * of the elements.
 */
public void resetFilters() {
	if (filters != null) {
		filters = null;
		refresh();
	}
}
/**
 * Ensures that the given element is visible, scrolling the viewer if necessary.
 * The selection is unchanged.
 *