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
if (isInContainer(dw, element))
					return true;
			}
		}
		if (container instanceof MPerspective) {
			MPerspective persp = (MPerspective) container;
			for (MWindow dw : persp.getWindows()) {
				if (isInContainer(dw, element))
					return true;
			}
		}
		return false;
	}
	MPlaceholder getLocalPlaceholder(MUIElement part) {
		return modelService.findPlaceholderFor(getWindow(), part);
	}
	public void switchPerspective(MPerspective perspective) {
		Assert.isNotNull(perspective);
		MWindow window = getWindow();
		if (window != null && isInContainer(window, perspective)) {
			perspective.getParent().setSelectedElement(perspective);
			List<MPart> newPerspectiveParts = modelService.findElements(perspective, null,
					MPart.class, null);
			
			if (newPerspectiveParts.contains(activePart)
					&& partActivationHistory.isValid(perspective, activePart)) {
				MPart target = activePart;
				IEclipseContext activeChild = activePart.getContext().getParent().getActiveChild();
				if (activeChild != null) {
					activeChild.deactivate();