Bug 320813 Minimized stacks are missing on restart
Run a fresh inner (no deltas) Detach the Outline view by dragging it right maximize the editor area close restart There are no minimized stacks visible If yoiu put a breakpoint in the WBWRenderer's processContents where it's restoring the trimBars before the restart you can see that there is only the one 'top' trim bar in the model, not sure where they went...I'll attach my deltas file, to my untrained eye the minimized stacks seem to be there (i.e. if you do a find on 'left(' there is a ToolControl defined).
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/ui/internal/workbench/XMLModelReconciler.java
while (container != rootObject) {
				container = getOriginalContainer(container);
				if (container == null) {
					return null;
				}
			}
		}
		return getResourceId(reference, originalContainer);
	}
	/**
	 * Creates an XML element that will capture the delta that occurred in the object.
	 * 
	 * @param document
	 *            the root XML document
	 * @param object
	 *            the object that has changed
	 * @param featureChange
	 *            the captured information about the change
	 * @param featureName
	 *            the name of the feature that has changed
	 * @return the XML element about the change
	 */
	private Element createDeltaElement(Document document, EObject object,
			FeatureChange featureChange, String featureName) {
		EStructuralFeature feature = featureChange.getFeature();
		if (object.eIsSet(feature)) {
			return createSetDeltaElement(document, object, featureChange, featureName, feature);
		}
		return createUnsetDeltaElement(document, featureChange, featureName);
	}