Bug 339702 SWTException thrown after clicking a dropdown toolbar twice and then something else
I20110310-2200 1. Click the dropdown for the 'Run' tool item once. 2. Click it again while the menu is still up (or just double-click that's fine too). 3. Now click somewhere else so that the menu goes away. 4. An SWTException is thrown. org.eclipse.swt.SWTException: Widget is disposed at org.eclipse.swt.SWT.error(SWT.java:4277) at org.eclipse.swt.SWT.error(SWT.java:4192) at org.eclipse.swt.SWT.error(SWT.java:4163) 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.isVisible(Menu.java:1134) at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.dropdownEvent(HandledContributionItem.java:466) at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.handleWidgetSelection(HandledContributionItem.java:425) at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.access$1(HandledContributionItem.java:423) at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem$2.handleEvent(HandledContributionItem.java:388) 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:4150) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3739)
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/HandledContributionItem.java
.get(EHandlerService.class.getName());
		lclContext.set(MItem.class.getName(), model);
		service.executeHandler(cmd);
		lclContext.remove(MItem.class.getName());
	}
	private boolean canExecuteItem() {
		ParameterizedCommand cmd = model.getWbCommand();
		if (cmd == null) {
			return false;
		}
		final IEclipseContext lclContext = getContext(model);
		EHandlerService service = lclContext.get(EHandlerService.class);
		return service.canExecute(cmd);
	}
	public void setParent(IContributionManager parent) {
		if (getParent() instanceof IMenuManager) {
			IMenuManager menuMgr = (IMenuManager) getParent();
			menuMgr.removeMenuListener(menuListener);
		}
		if (parent instanceof IMenuManager) {
			IMenuManager menuMgr = (IMenuManager) parent;
			menuMgr.addMenuListener(menuListener);
		}
		super.setParent(parent);
	}
	private ImageDescriptor getImageDescriptor(MUILabel element) {
		String iconURI = element.getIconURI();
		if (iconURI != null && iconURI.length() > 0) {
			return resUtils.imageDescriptorFromURI(URI.createURI(iconURI));
		}