Bug 295611 [UI] The MPart tests leave many open shells
This turns out to be caused by the PRE's 'stop' method only working correctly when an MApplication is the 'uiRoot' element.
bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/workbench/swt/internal/PartRenderingEngine.java
AbstractPartRenderer parentFactory = getFactoryFor(parentElement);
				if (parentFactory != null)
					parentFactory.childRendered(parentElement, element);
			}
		} else {
			
			if (element instanceof MContext) {
				MContext ctxt = (MContext) element;
				IEclipseContext lclContext = ctxt.getContext();
				if (lclContext instanceof IDisposable) {
					((IDisposable) lclContext).dispose();
				}
			}
		}
		return newWidget;
	}
	private IEclipseContext getContext(MElementContainer<MUIElement> parent) {
		MUIElement uiElement = parent;
		while (uiElement != null) {
			if (uiElement instanceof MContext) {
				return ((MContext) uiElement).getContext();
			}
			uiElement = uiElement.getParent();
		}
		return null;
	}
	public Object createGui(MUIElement element) {
		
		Object parent = null;
		MUIElement parentME = element.getParent();