@Override
  public @NotNull ModificationTracker forLanguages(@NotNull Predicate<? super Language> condition) {
    return () -> {
      long result = myAllLanguagesTracker.getModificationCount();
      for (Language l : myLanguageTrackers.keySet()) {
        if (!condition.test(l)) continue;
        result += myLanguageTrackers.get(l).getModificationCount();
      }
      return result;
    };
  }
@Override
  public @NotNull ModificationTracker forLanguages(@NotNull Predicate<? super Language> condition)