Bug 307747 EPartService doesn't render new parts
1. Have a part in a stack, it is the selected part. 2. Show another part in that stack using PartState.CREATE or PartState.VISIBLE. 3. The part should've been rendered. It is not.
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/workbench/ui/internal/PartServiceImpl.java
curContext = part.getContext();
			}
			IEclipseContext parentContext = pwc.getContext();
			if (parentContext != null) {
				parentContext.set(IContextConstants.ACTIVE_CHILD, curContext);
				curContext = parentContext;
			}
			pwc = getParentWithContext((MUIElement) pwc);
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.e4.workbench.modeling.EPartService#getActivePart()
	 */
	public MPart getActivePart() {
		return activePart;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.e4.workbench.modeling.EPartService#deactivate(org.eclipse.e4.ui.model.application
	 * .MPart)
	 */
	public void deactivate(MPart part) {
		MElementContainer<MUIElement> parent = part.getParent();
		MPart oldSelectedElement = (MPart) parent.getSelectedElement();
		if (oldSelectedElement == part) {
			parent.setSelectedElement(null);