Bug 110169 [Navigator] ResourceNavigator.initWorkingSetFilter should be protected visibility.
The above mentioned method seems mistakingly have an incorrect visibility. E.g. the method initResourceSorter is protected. I don't see why initResourceSorter is not protected.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/navigator/ResourceNavigator.java
public void createPartControl(Composite parent) {
        TreeViewer viewer = createViewer(parent);
        this.viewer = viewer;
        if (memento != null) {
            restoreFilters();
            restoreLinkingEnabled();
        }
        frameList = createFrameList();
        initDragAndDrop();
        updateTitle();
        initContextMenu();
        initResourceSorter();
        initWorkingSetFilter();
        
        
        viewer.setInput(getInitialInput());
        
        
        makeActions();
        
        
        getActionGroup().fillActionBars(getViewSite().getActionBars());
        updateActionBars((IStructuredSelection) viewer.getSelection());
        getSite().setSelectionProvider(viewer);
        getSite().getPage().addPartListener(partListener);
        IWorkingSetManager workingSetManager = getPlugin().getWorkbench()
                .getWorkingSetManager();
        workingSetManager.addPropertyChangeListener(propertyChangeListener);
        if (memento != null) {
			restoreState(memento);