expandedThresholdsList property
thresholdsの各要素をリストに変換し、それらを連結したリストを返す
Implementation
@visibleForTesting
List<double> get expandedThresholdsList {
final thresholdsList = thresholds
.map((threshold) => threshold.toList)
.expand((element) => element)
.toList();
return thresholdsList;
}