Bug 303801 IAE thrown when moving a part from one stack to another
1. Start the photo demo. 2. Move the 'Thumbnails' view to the stack of the 'Location' view. 3. An IAE is thrown. java.lang.IllegalArgumentException: Widget has the wrong parent at org.eclipse.swt.SWT.error(SWT.java:4064) at org.eclipse.swt.SWT.error(SWT.java:3998) at org.eclipse.swt.SWT.error(SWT.java:3969) at org.eclipse.swt.custom.CTabItem.setControl(CTabItem.java:283) at org.eclipse.e4.workbench.ui.renderers.swt.StackRenderer.createTab(StackRenderer.java:286) at org.eclipse.e4.workbench.ui.renderers.swt.StackRenderer.childRendered(StackRenderer.java:313) at org.eclipse.e4.ui.workbench.swt.internal.PartRenderingEngine$2.handleEvent(PartRenderingEngine.java:139) 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.workbench.ui.internal.UIEventPublisher.notifyChanged(UIEventPublisher.java:58) at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:280) 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.addUnique(NotifyingListImpl.java:305) at org.eclipse.emf.common.util.AbstractEList.add(AbstractEList.java:307) at org.eclipse.e4.workbench.ui.renderers.swt.dnd.DragHost.drop(DragHost.java:119) at org.eclipse.e4.workbench.ui.renderers.swt.dnd.DnDManager.endDrag(DnDManager.java:224) at org.eclipse.e4.workbench.ui.renderers.swt.dnd.DnDManager$2.handleEvent(DnDManager.java:73) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/StackRenderer.java
if (tb != null) {
			if (tb.getSize().y > ctf.getTabHeight())
				ctf.setTabHeight(tb.getSize().y);
			
			
			String cssClassName = (String) ctf
					.getData("org.eclipse.e4.ui.css.CssClassName"); 
			stylingEngine.setClassname(tb, cssClassName);
			ctf.setTopRight(tb, SWT.RIGHT);
			ctf.layout(true);
			
			
			
			
			
			
			
			
			
			ctf.notifyListeners(SWT.Resize, null);
		}
	}
	private ToolBar getToolbar(MUIElement element) {
		if (!(element instanceof MPart))
			return null;
		MPart part = (MPart) element;
		boolean hasMenu = part.getMenus() != null && part.getMenus().size() > 0;
		boolean hasTB = part.getToolbar() != null;
		if (!hasMenu && !hasTB)
			return null;