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/MainActionGroup.java
private NewWizardMenu newWizardMenu;
    /**
     * Constructs the main action group.
     * 
     * @param navigator the navigator view
     */
    public MainActionGroup(IResourceNavigator navigator) {
        super(navigator);
        resourceChangeListener = new IResourceChangeListener() {
            public void resourceChanged(IResourceChangeEvent event) {
                handleResourceChanged(event);
            }
        };
        ResourcesPlugin.getWorkspace().addResourceChangeListener(
                resourceChangeListener, IResourceChangeEvent.POST_CHANGE);
        makeSubGroups();
    }
    /**
     * Handles a resource changed event by updating the enablement
     * if one of the selected projects is opened or closed.
     */
    protected void handleResourceChanged(IResourceChangeEvent event) {
        ActionContext context = getContext();
        if (context == null) {
            return;
        }
        final IStructuredSelection selection = (IStructuredSelection) context
                .getSelection();
        if (ResourceSelectionUtil.allResourcesAreOfType(selection,
                IResource.PROJECT) == false) {