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
return;
		}
		MContext parentPart = getParentWithContext(oldSelectedElement);
		if (parentPart == null) {
			
			return;
		}
		IEclipseContext parentContext = parentPart.getContext();
		IEclipseContext oldContext = getSubContext(oldSelectedElement);
		Object child = parentContext.getActiveChild();
		if (child == null || oldContext == null || child == oldContext) {
			if (part == null) {
				
				IEclipseContext currentActive = parentContext.getActiveChild();
				if (currentActive != null)
					currentActive.deactivate();
			} else
				part.getContext().activate();
		}
	}
	public MPart findPart(String id) {
		MApplicationElement element = modelService.find(id, getContainer());
		if (element instanceof MPlaceholder) {
			((MPlaceholder) element).getRef().setCurSharedRef((MPlaceholder) element);
			element = ((MPlaceholder) element).getRef();
		}
		return element instanceof MPart ? (MPart) element : null;
	}
	public Collection<MPart> getParts() {
		return modelService.findElements(getContainer(), null, MPart.class, null);