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
if (e.detail == SWT.ARROW) {
								Menu menu = getMenu(mmenu, ti);
								Rectangle itemBounds = ti.getBounds();
								Point displayAt = ti.getParent().toDisplay(
										itemBounds.x,
										itemBounds.y + itemBounds.height);
								menu.setLocation(displayAt);
								menu.setVisible(true);
								Display display = menu.getDisplay();
								while (menu.isVisible()) {
									if (!display.readAndDispatch()) {
										display.sleep();
									}
								}
							}
						}
					});
				}
			}
		}
		
		if (me instanceof MContribution
				&& ((MContribution) me).getContributionURI() != null) {
			final MToolItem item = (MToolItem) me;
			final MContribution contrib = (MContribution) me;
			final IEclipseContext lclContext = getContext(me);
			ToolItem ti = (ToolItem) me.getWidget();
			ti.addSelectionListener(new SelectionListener() {
				public void widgetSelected(SelectionEvent e) {
					if (contrib.getObject() == null) {