public static void setRainbowEnabled(@NotNull SchemeMetaInfo colorsScheme, @Nullable Language language, @Nullable Boolean enabled) {
    Properties properties = colorsScheme.getMetaProperties();
    String key = getKey(language);
    if (enabled == null || language == null && enabled == DEFAULT_RAINBOW_ON) {
      properties.remove(key);
    }
    else {
      properties.setProperty(key, String.valueOf(enabled));
    }
  }
public static void setRainbowEnabled(@NotNull SchemeMetaInfo colorsScheme, @Nullable Language language, @Nullable Boolean enabled)