Bug 313382 No 'X' close buttons on views
The renderer is currently ignoring the 'closeable' feature for MParts if it's actually represented by a placeholder (i.e. 3.x views).
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/StackRenderer.java
CTabFolder ctf = (CTabFolder) me.getWidget();
		ctf.addSelectionListener(new SelectionListener() {
			public void widgetDefaultSelected(SelectionEvent e) {
			}
			public void widgetSelected(SelectionEvent e) {
				
				if (ignoreTabSelChanges)
					return;
				MUIElement ele = (MUIElement) e.item.getData(OWNING_ME);
				ele.getParent().setSelectedElement(ele);
				activateStack(stack);
			}
		});
		CTabFolder2Adapter closeListener = new CTabFolder2Adapter() {
			public void close(CTabFolderEvent event) {
				MUIElement uiElement = (MUIElement) event.item
						.getData(AbstractPartRenderer.OWNING_ME);
				MPart part = (MPart) ((uiElement instanceof MPart) ? uiElement
						: ((MPlaceholder) uiElement).getRef());
				IEclipseContext partContext = part.getContext();
				
				IEclipseContext context = partContext == null ? StackRenderer.this.context
						: partContext;
				
				EPartService partService = (EPartService) context
						.get(EPartService.class.getName());
				if (partService.savePart(part, true)) {
					partService.hidePart(part);
				} else {