Bug 313407 EPartService needs to use EModelService's bringToTop method
The EMS variant considers shared parts, the EPS should delegate accordingly.
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/workbench/ui/internal/PartServiceImpl.java
return isInContainer(rootContainer, part);
	}
	private boolean isInContainer(MElementContainer<?> container, MPart part) {
		for (Object object : container.getChildren()) {
			if (object == part) {
				return true;
			} else if (object instanceof MElementContainer<?>) {
				if (isInContainer((MElementContainer<?>) object, part)) {
					return true;
				}
			}
		}
		return false;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.e4.workbench.modeling.EPartService#activate(org.eclipse.e4.ui.model.application
	 * .MPart)
	 */
	public void activate(MPart part) {
		if (part == activePart)
			return;
		if (!isInContainer(part)) {
			return;
		}
		modelService.bringToTop(window, part);
		IEclipseContext context = part.getContext();
		IEclipseContext parent = context.getParent();