src/vs/base/browser/ui/list/listPaging.ts/PagedList/onContextMenu
class PagedList:	get onContextMenu(): Event<IListContextMenuEvent<T>> {
		return Event.map(this.list.onContextMenu, ({ element, index, anchor, browserEvent }) => (typeof element === 'undefined' ? { element, index, anchor, browserEvent } : { element: this._model.get(element), index, anchor, browserEvent }));
	}