Bug 330803 SWTException from tool item dropdowns after closing/reopening perspectives
1. Click the 'Run' tool item's dropdown arrow. 2. Window > Close Perspective 3. Window > Open Perspective > Other... > Java 4. Repeat step 1. org.eclipse.swt.SWTException: Widget is disposed at org.eclipse.swt.SWT.error(SWT.java:4091) at org.eclipse.swt.SWT.error(SWT.java:4006) at org.eclipse.swt.SWT.error(SWT.java:3977) at org.eclipse.swt.widgets.Widget.error(Widget.java:468) at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:340) at org.eclipse.swt.widgets.Menu.setLocation(Menu.java:1427) at org.eclipse.e4.ui.workbench.renderers.swt.ToolItemRenderer$5.widgetSelected(ToolItemRenderer.java:315) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:234) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4084) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3675) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$6.run(PartRenderingEngine.java:780) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:696) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:91)
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/ToolItemRenderer.java
IContributionFactory cf = (IContributionFactory) lclContext
								.get(IContributionFactory.class.getName());
						contrib.setObject(cf.create(
								contrib.getContributionURI(), lclContext));
					}
					lclContext.set(MItem.class.getName(), item);
					ContextInjectionFactory.invoke(contrib.getObject(),
							Execute.class, lclContext);
					lclContext.remove(MItem.class.getName());
				}
				public void widgetDefaultSelected(SelectionEvent e) {
				}
			});
		} else if (me instanceof MHandledItem) {
			final MHandledItem item = (MHandledItem) me;
			final IEclipseContext lclContext = getContext(me);
			final ToolItem ti = (ToolItem) me.getWidget();
			final Display display = ti.getDisplay();
			display.timerExec(500, new Runnable() {
				boolean logged = false;
				public void run() {
					if (ti.isDisposed()) {
						return;
					}
					SafeRunner.run(new ISafeRunnable() {
						public void run() throws Exception {
							EHandlerService service = lclContext
									.get(EHandlerService.class);
							if (service == null) {