private @Nullable Boolean getDefaultBreadcrumbVisibility(@NotNull String languageID) {
    Boolean defaultVisible = myDefaultBreadcrumbVisibility.get(languageID);
    if (defaultVisible == null) {
      for (BreadcrumbsProvider provider : BreadcrumbsProvider.EP_NAME.getExtensionList()) {
        for (Language language : provider.getLanguages()) {
          myDefaultBreadcrumbVisibility.put(language.getID(), provider.isShownByDefault());
        }
      }
      defaultVisible = myDefaultBreadcrumbVisibility.get(languageID);
    }
    return defaultVisible;
  }
private @Nullable Boolean getDefaultBreadcrumbVisibility(@NotNull String languageID)