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
return IDEWorkbenchPlugin.getDefault();
    }
    /**
     * Returns the sorter.
     * @since 2.0
     */
    public ResourceSorter getSorter() {
        return (ResourceSorter) getTreeViewer().getSorter();
    }
    /**
     * Returns the resource viewer which shows the resource hierarchy.
     * @since 2.0
     */
    public TreeViewer getViewer() {
        return viewer;
    }
    /**
     * Returns the tree viewer which shows the resource hierarchy.
     * @return the tree viewer
     * @since 2.0
     */
    public TreeViewer getTreeViewer() {
        return viewer;
    }
    /**
     * Returns the shell to use for opening dialogs.
     * Used in this class, and in the actions.
     * 
     * @return the shell
     * @deprecated use getViewSite().getShell()