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 ViewerSorter getSorter() {
	return sorter;
}
/**
 * Handles a double-click select event from the widget.
 * <p>
 * This method is internal to the framework; subclassers should not call
 * this method.
 * </p>
 *
 * @param event the SWT selection event
 */
protected void handleDoubleSelect(SelectionEvent event) {
	
	Control control = getControl();
	if (control != null && !control.isDisposed()) {
		ISelection selection = getSelection();
		updateSelection(selection);
		fireDoubleClick(new DoubleClickEvent(this, selection));
	}
}
/**
 * Handles an open event from the OpenStrategy.
 * <p>
 * This method is internal to the framework; subclassers should not call
 * this method.
 * </p>
 *
 * @param event the SWT selection event