src/vs/base/browser/ui/list/listWidget.ts/KeyboardController/onKeyDown
class KeyboardController:	private get onKeyDown(): Event.IChainableEvent<StandardKeyboardEvent> {
		return this.disposables.add(Event.chain(this.disposables.add(new DomEmitter(this.view.domNode, 'keydown')).event)
			.filter(e => !isInputElement(e.target as HTMLElement))
			.map(e => new StandardKeyboardEvent(e)));
	}