src/vs/base/browser/ui/list/listView.ts/ListView/onContextMenu
class ListView:	@memoize get onContextMenu(): Event<IListMouseEvent<T> | IListGestureEvent<T>> { return Event.any(Event.map(this.disposables.add(new DomEmitter(this.domNode, 'contextmenu')).event, e => this.toMouseEvent(e), this.disposables), Event.map(this.disposables.add(new DomEmitter(this.domNode, TouchEventType.Contextmenu)).event as Event<GestureEvent>, e => this.toGestureEvent(e), this.disposables)); }