Bug 29914 Icons for "Sync with Editor", "Collapse All"
We currently have no colored (hover) icon for the "Sync with Editor" and "Collapse All" actions. Also there is not disabled icon for the "Sync with Editor" action.
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/navigator/MainActionGroup.java
*/
	public void fillContextMenu(IMenuManager menu) {
		IStructuredSelection selection =
			(IStructuredSelection) getContext().getSelection();
		boolean onlyFilesSelected =
			!selection.isEmpty()
				&& ResourceSelectionUtil.allResourcesAreOfType(selection, IResource.FILE);
		
	
		MenuManager newMenu =
			new MenuManager(ResourceNavigatorMessages.getString("ResourceNavigator.new")); 
		menu.add(newMenu);
		new NewWizardMenu(newMenu, navigator.getSite().getWorkbenchWindow(), false);
		
		gotoGroup.fillContextMenu(menu);
		openGroup.fillContextMenu(menu);
		menu.add(new Separator());
		
		refactorGroup.fillContextMenu(menu);
		menu.add(new Separator());
		
		menu.add(importAction);
		menu.add(exportAction);
		importAction.selectionChanged(selection);
		exportAction.selectionChanged(selection);
		menu.add(new Separator());
				
		if (onlyFilesSelected) {
			addBookmarkAction.selectionChanged(selection);
			menu.add(addBookmarkAction);