Bug 318856 Most entries contributed by textual editors are missing in the 'Edit' menu
I20100701-1105. 1. start new workspace 2. create a Java project 3. create a file 4. open 'Edit' main menu ==> most contributed items are missing (e.g. content assist, find actions).
bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/workbench/swt/modeling/MenuServiceFilter.java
if (!item.isToBeRendered() || !item.isVisible()
				|| item.getWidget() == null) {
			return;
		}
		ParameterizedCommand cmd = item.getWbCommand();
		if (cmd == null) {
			return;
		}
		final IEclipseContext lclContext = modelService
				.getContainingContext(item);
		EHandlerService service = lclContext.get(EHandlerService.class);
		item.setEnabled(service.canExecute(cmd));
	}
	private void unrender(final List<MMenuElement> menuModel) {
		trace("unrender", null, null);
		for (MMenuElement element : menuModel) {
			renderer.removeGui(element);
		}
	}
	private void removeMenuContributions(final MMenu menuModel,
			final ArrayList<MMenuElement> menuContributionsToRemove) {
		for (MMenuElement item : menuContributionsToRemove) {
			trace("removeMenuContributions " + item,
					(Widget) menuModel.getWidget(), menuModel);
			menuModel.getChildren().remove(item);
		}
	}
	private void handlerRenderedMenu(final Event event, final Menu menu,
			final MRenderedMenu menuModel) {