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/PartActivationHistory.java
return candidate;
				}
			}
		}
		return null;
	}
	MPart getNextActivationCandidate(Collection<MPart> validParts, MPart part) {
		MArea area = isInArea(part);
		if (area != null) {
			
			MPart candidate = getSiblingActivationCandidate(part);
			if (candidate != null) {
				return candidate;
			}
			
			candidate = findActivationCandidate(
					modelService.findElements(area, null, MPart.class, null), part);
			if (candidate != null) {
				return candidate;
			}
		}
		
		Collection<MPart> validCandidates = new ArrayList<MPart>();
		for (MPart validPart : generalActivationHistory) {
			if (validParts.contains(validPart)) {
				validCandidates.add(validPart);
			}
		}
		MPart candidate = findActivationCandidate(validCandidates, part);