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
}
			}
			Composite stylingWrapper = createWrapperForStyling(
					(Composite) parentWidget, part.getContext());
			
			
			
			final CTabFolder ctf = new ETabFolder(stylingWrapper, SWT.BORDER
					| styleModifier);
			configureForStyling(ctf);
			ctf.setUnselectedCloseVisible(showCloseAlways);
			bindWidget(part, ctf);
			ctf.setVisible(true);
			newWidget = ctf;
			final IEclipseContext folderContext = part.getContext();
			folderContext.set(IContextConstants.DEBUG_STRING, "TabFolder"); 
			final IEclipseContext toplevelContext = getToplevelContext(part);
			final IStylingEngine engine = (IStylingEngine) folderContext
					.get(IStylingEngine.SERVICE_NAME);
			folderContext.runAndTrack(new Runnable() {
				public void run() {
					
					
					if (ctf.isDisposed())
						return;
					IEclipseContext currentActive = toplevelContext;
					IEclipseContext child;
					while (currentActive != folderContext
							&& (child = (IEclipseContext) currentActive
									.get("activeChild")) != null && child != currentActive) {