Bug 299340 [CommonNavigator] Enable new CNF tests
Enable the contributed CNF tests, make minor test improvements.
tests/org.eclipse.ui.tests.navigator/src/org/eclipse/ui/tests/navigator/NavigatorTestBase.java
TreeItem[] rootItems = _viewer.getTree().getItems();
			if (rootItems.length > 0)
				rootItems[0].setText("");
		} catch (Exception ex) {
			
		}
		_viewer.refresh();
	}
	protected Object verifyMenu(IStructuredSelection sel, String item) {
		MenuManager mm = new MenuManager();
		_actionService.setContext(new ActionContext(sel));
		_actionService.fillContextMenu(mm);
		IContributionItem[] items = mm.getItems();
		for (int i = 0; i < items.length; i++) {
			if (items[i] instanceof MenuManager) {
				MenuManager childMm = (MenuManager) items[i];
				if (DEBUG) {
					System.out.println("menu text: " + childMm.getMenuText());
				}
				if (childMm.getMenuText().indexOf(item) >= 0)
					return childMm;
			} else if (items[i] instanceof ActionContributionItem) {
				ActionContributionItem aci = (ActionContributionItem) items[i];
				if (DEBUG) {
					System.out.println("action text: "
							+ aci.getAction().getText());
				}
				if (aci.getAction().getText().indexOf(item) >= 0)
					return aci;
			}