Bug 327033 Workbench doesn't relayout after a stack disappears
If you close all the views of a stack, you just get an empty rectangle of space now. Resizing your window will adjust the layout properly. Note that reopening the views don't help, you still have to resize something to force a layout.
bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/internal/workbench/swt/PartRenderingEngine.java
if (element instanceof MContext) {
				MContext ctxt = (MContext) element;
				IEclipseContext lclContext = ctxt.getContext();
				if (lclContext instanceof IDisposable) {
					((IDisposable) lclContext).dispose();
				}
			}
		}
		return newWidget;
	}
	private IEclipseContext getContext(MElementContainer<MUIElement> parent) {
		if (parent instanceof MContext) {
			return ((MContext) parent).getContext();
		}
		return modelService.getContainingContext(parent);
	}
	public Object createGui(MUIElement element) {
		
		Object parent = null;
		MUIElement parentME = element.getParent();
		if (parentME == null)
			parentME = (MUIElement) ((EObjectImpl) element).eContainer();
		if (parentME != null) {
			AbstractPartRenderer renderer = getRendererFor(parentME);
			if (renderer != null) {
				if (!element.isVisible()) {
					parent = getLimboShell();
				} else {
					parent = renderer.getUIContainer(element);
				}