Bug 283194 [UI] StackModelFactory does not need 'engine' local
We can remove this from createWidget() final IStylingEngine engine = (IStylingEngine) folderContext .get(IStylingEngine.SERVICE_NAME); because the engine is now passed in via DI. Replace the refs to "engine" with the local "stylingEngine".
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/StackRenderer.java
Control ctrl = (Control) element.getWidget();
			if (ctrl != null) {
				showTab((MItemPart<?>) element);
				stylingEngine.style(ctrl);
			}
		}
	}
	private CTabItem findItemForPart(MPart<?> folder, MPart<?> part) {
		CTabFolder ctf = (CTabFolder) folder.getWidget();
		if (ctf == null)
			return null;
		CTabItem[] items = ctf.getItems();
		for (int i = 0; i < items.length; i++) {
			if (items[i].getData(OWNING_ME) == part)
				return items[i];
		}
		return null;
	}
	private void hookTabControllerLogic(final MPart<?> parentElement,
			final MPart<?> childElement, final CTabItem cti) {
		
		IObservableValue textObs = EMFObservables
				.observeValue((EObject) childElement,
						ApplicationPackage.Literals.MITEM__NAME);
		ISWTObservableValue uiObs = SWTObservables.observeText(cti);
		dbc.bindValue(uiObs, textObs, null, null);
		
		IObservableValue emfTTipObs = EMFObservables.observeValue(
				(EObject) childElement,