Bug 319976 [Compatibility] Dragging Outline view causes NPE
From no deltas.xml, I opened the Team Sync perspective, sync'ed up, and then switched back to the java perspective. Then I dragged my outline view over to my package explorer stack. It output this to the console: bash-3.2$ 2010-07-15 08:26:56.808 Log ErrorException while dispatching event org.osgi.service.event.Event [topic=org/eclipse/e4/ui/model/ui/ElementContainer/selectedElement/SET] to handler org.eclipse.e4.ui.services.internal.events.UIEventHandler@7b047b04 java.lang.NullPointerException at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer.hideElementRecursive(LazyStackRenderer.java:163) at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer.access$0(LazyStackRenderer.java:154) at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer$1.handleEvent(LazyStackRenderer.java:71) 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:67) 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.workbench.renderers.swt.StackRenderer.hideChild(StackRenderer.java:386) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$3.handleEvent(PartRenderingEngine.java:216) 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:67) 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.emf.common.notify.impl.NotificationImpl.dispatch(NotificationImpl.java:1033) at org.eclipse.emf.common.notify.impl.NotificationImpl.dispatch(NotificationImpl.java:1038) at org.eclipse.emf.common.notify.impl.NotifyingListImpl.remove(NotifyingListImpl.java:724) at org.eclipse.emf.common.util.AbstractEList.remove(AbstractEList.java:466) at org.eclipse.e4.ui.workbench.addons.dndaddon.StackDropAgent.drop(StackDropAgent.java:60) at org.eclipse.e4.ui.workbench.addons.dndaddon.DnDManager.startDrag(DnDManager.java:192) at org.eclipse.e4.ui.workbench.addons.dndaddon.DnDManager$3.handleEvent(DnDManager.java:112) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1525) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1257) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3552) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3171) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:718) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:643) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:106) at org.eclipse.ui.internal.Workbench$3.run(Workbench.java:535) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:519) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:600) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574) at org.eclipse.equinox.launcher.Main.run(Main.java:1407)
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/LazyStackRenderer.java
measureComposite.setBackgroundImage(toolImage);
								toolComposite.setBackground(c.getDisplay()
										.getSystemColor(SWT.COLOR_WHITE));
								toolComposite.setBackgroundImage(null);
								ctf.setTopRight(measureComposite, SWT.FILL);
								ctf.setHeaderControl(toolComposite);
								ctf.layout();
							}
							int compWidth = toolComposite.getSize().x;
							if (compWidth > requiredWidth) {
								c.setBounds(compWidth - requiredWidth, 0,
										requiredWidth, requiredHeight);
							} else {
								barSize = c.computeSize(compWidth, SWT.DEFAULT);
								c.setBounds(compWidth - barSize.x, 0,
										compWidth, barSize.y);
							}
							ignoreResize = false;
						}
					});
					ctf.setTopRight(toolComposite, SWT.FILL);
				}
			}
			element = ref;
		}
		if (element instanceof MContext) {
			IEclipseContext context = ((MContext) element).getContext();
			if (context != null) {
				IEclipseContext newParentContext = modelService
						.getContainingContext(element);