void copyMissingAttributes(@NotNull AbstractColorsScheme sourceScheme) {
    sourceScheme.colorMap.forEach((key, color) -> colorMap.putIfAbsent(key, color));
    sourceScheme.attributesMap.forEach((key, attributes) -> attributesMap.putIfAbsent(key, attributes));
  }
void copyMissingAttributes(@NotNull AbstractColorsScheme sourceScheme)