Bug 303831 Warnings logged when trying to merge changes to an MPart's 'closeable' attribute
Warnings are printed out to syserr. --- WARNING: Unknown feature found, reconciliation may fail: Part#closeable
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/workbench/ui/internal/XMLModelReconciler.java
if (key instanceof MBindingContainer) {
					for (FeatureChange change : entry.getValue()) {
						if (change.getFeatureName().equals(BINDINGCONTAINER_BINDINGS_ATTNAME)) {
							List<?> commands = (List<?>) change.getValue();
							for (Object command : commands) {
								if (command == reference) {
									return key;
								}
							}
							bindingsChanged = true;
							break;
						}
					}
				}
			}
			if (!bindingsChanged) {
				return reference.eContainer();
			}
		}
		if (reference instanceof MUIElement) {
			EMap<EObject, EList<FeatureChange>> objectChanges = changeDescription
					.getObjectChanges();
			for (Entry<EObject, EList<FeatureChange>> entry : objectChanges.entrySet()) {
				EObject key = entry.getKey();
				if (key == reference) {
					for (FeatureChange change : entry.getValue()) {
						if (change.getFeatureName().equals(UIELEMENT_PARENT_ATTNAME)) {
							return (EObject) change.getValue();
						}
					}