Bug 97821 [package explorer] eternal loop when recreating deleted compilation unit
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
private IElementComparer createElementComparer() {
		if (showProjects()) 
			return null;
		else
			return WorkingSetModel.COMPARER;
	}
	
	private void fillActionBars() {
		IActionBars actionBars= getViewSite().getActionBars();
		fActionSet.fillActionBars(actionBars);
	}
	
	private Object findInputElement() {
		if (showWorkingSets()) {
			return fWorkingSetModel;
		} else {
			Object input= getSite().getPage().getInput();
			if (input instanceof IWorkspace) { 
				return JavaCore.create(((IWorkspace)input).getRoot());
			} else if (input instanceof IContainer) {
				IJavaElement element= JavaCore.create((IContainer)input);
				if (element != null && element.exists())
					return element;
				return input;
			}
			
			
			
			return JavaCore.create(JavaPlugin.getWorkspace().getRoot());