Bug 94456 [Undo] - Resource Navigator not showing workspace undo actions
The Resource Navigator is not showing the workspace undo actions. Package Explorer is correctly working. Need to look at the difference in the way the action handlers are set up.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/navigator/ResourceNavigator.java
* @since 2.0
     */
    public IWorkingSet getWorkingSet() {
        return workingSetFilter.getWorkingSet();
    }
    /**
     * Returns the navigator's plugin.
     */
    public AbstractUIPlugin getPlugin() {
        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
     */