Bug 329482 Uninstantiated part may be rendered when closing another part in the same stack
1. Activate the 'Javadoc' view. 2. Activate the 'Package Explorer' view. 3. Shutdown. 4. Restart. 5. Ctrl+3 > Properties 6. Hide the 'Properties' view. 7. Now the 'Problems' view is the selected element. It should be the 'Javadoc' view.
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/ui/internal/workbench/PartServiceImpl.java
MPartStack stack = BasicFactoryImpl.eINSTANCE.createPartStack();
			searchRoot.getChildren().add(stack);
			return stack;
		}
		MElementContainer<?> lastContainer = getLastContainer(searchRoot, children);
		if (lastContainer == null) {
			MPartStack stack = BasicFactoryImpl.eINSTANCE.createPartStack();
			searchRoot.getChildren().add(stack);
			return stack;
		} else if (!(lastContainer instanceof MPartStack)) {
			MPartStack stack = BasicFactoryImpl.eINSTANCE.createPartStack();
			((List) lastContainer.getChildren()).add(stack);
			return stack;
		}
		return lastContainer;
	}
	private MElementContainer<?> getLastContainer(MElementContainer<?> container, List<?> children) {
		if (children.isEmpty()) {
			return null;
		}
		for (int i = children.size() - 1; i > -1; i--) {
			Object muiElement = children.get(i);
			if (muiElement instanceof MElementContainer<?>) {
				MElementContainer<?> childContainer = (MElementContainer<?>) muiElement;
				MElementContainer<?> lastContainer = getLastContainer(childContainer,
						childContainer.getChildren());
				if (lastContainer != null) {
					return lastContainer;
				}
			}