Bug 325148 EPS should not select an unrendered element when hiding a part
1. Open a file. 2. Drag a view into the editor stack. 3. Close the view. 4. Close the editor. java.lang.NullPointerException at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.setCSSInfo(SWTPartRenderer.java:68) at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.bindWidget(SWTPartRenderer.java:96) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createWidget(PartRenderingEngine.java:574) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:414) at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.showTab(StackRenderer.java:547) at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer$1.handleEvent(LazyStackRenderer.java:75) at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:41) at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:188) at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:198) at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:227) at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:149) at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:139) at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:78) at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:39) at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:73) at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:58) at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:380) at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElement(ElementContainerImpl.java:159) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.hidePart(PartServiceImpl.java:734) at org.eclipse.ui.internal.WorkbenchPage.hidePart(WorkbenchPage.java:999) at org.eclipse.ui.internal.WorkbenchPage.closeEditors(WorkbenchPage.java:899) at org.eclipse.ui.internal.WorkbenchPage.closeEditor(WorkbenchPage.java:1055) at org.eclipse.ui.internal.CloseEditorHandler.execute(CloseEditorHandler.java:47)
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
window.getChildren().add(partStack);
			for (int j = 0; j < partIds[i].length; j++) {
				MPart part = BasicFactoryImpl.eINSTANCE.createPart();
				part.setElementId(partIds[i][j]);
				partStack.getChildren().add(part);
			}
		}
		initialize(applicationContext, application);
		return application;
	}
	private void initialize(IEclipseContext applicationContext,
			MApplication application) {
		application.setContext(applicationContext);
		applicationContext.set(MApplication.class.getName(), application);
		E4Workbench.processHierarchy(application);
		((Notifier) application).eAdapters().add(
				new UIEventPublisher(applicationContext));
		applicationContext.set(ISaveHandler.class.getName(),
				new ISaveHandler() {
					public Save[] promptToSave(Collection<MPart> saveablePart) {
						Save[] ret = new Save[saveablePart.size()];
						Arrays.fill(ret, ISaveHandler.Save.YES);
						return ret;
					}
					public Save promptToSave(MPart saveablePart) {
						return ISaveHandler.Save.YES;
					}
				});
	}
	class PartListener implements IPartListener {