src/vs/base/browser/ui/list/listWidget.ts/KeyboardController/updateOptions
class KeyboardController:	updateOptions(optionsUpdate: IListOptionsUpdate): void {
		if (optionsUpdate.multipleSelectionSupport !== undefined) {
			this.multipleSelectionDisposables.clear();

			if (optionsUpdate.multipleSelectionSupport) {
				this.onKeyDown.filter(e => (platform.isMacintosh ? e.metaKey : e.ctrlKey) && e.keyCode === KeyCode.KeyA).on(this.onCtrlA, this, this.multipleSelectionDisposables);
			}
		}
	}