Fix cache clear on remote publish in Sitecore language fallback module

ItemExtensions.cs

public static Item GetFallbackItem(this Item item)
{
  Assert.IsNotNull(item, "item cannot be null");

  var success = false;
  int iterations = 0, maxIterations = 5;
  while (iterations++ < maxIterations)
  {
    var fallbackLang = item.Language.GetFallbackLanguage(item.Database);
    if (fallbackLang != null &&
       !fallbackLang.Name.IsNullOrEmpty() &&
       !fallbackLang.Equals(item.Language))
    {
      item = item.Database.GetItem(item.ID, fallbackLang, Version.Latest);
      if (item != null && item.Versions.Count > 0)
      {
        success = true;
        break;
      }
    }
  }

  return success ? item : null;
}

public static bool HasFallbackVersion(this Item item)
{
  if (item.Versions.Count > 0)
  {
    return true;
  }
  
  var fallbackItem = item.GetFallbackItem();
  return fallbackItem != null && fallbackItem.Versions.Count > 0;
}

LanguageFallbackProvider.cs

private void ClearFallbackCaches(PublishEndRemoteEvent publishArgs, Database database)
{
  Assert.ArgumentNotNull(publishArgs, "publishArgs");
  Assert.ArgumentNotNull(database, "database");

  var cache = _fallbackValuesCaches[database.Name];
  var ignore_cache = _fallbackIgnoreCaches[database.Name];

  var rootItemId = new ID(publishArgs.RootItemId);
  var itemIds = new List<string>(256);
  itemIds.Add(rootItemId.ToString());
  
  if (publishArgs.Deep)
  {
    var rootItem = database.GetItem(rootItemId);
    if (rootItem != null)
    {
      using (var context = ContentSearchManager.GetIndex("sitecore_web_index").CreateSearchContext())
      {
        // get all items in medialibrary
        var query = context.GetQueryable<SearchResultItem>().Where(i => i.Paths.Contains(rootItemId));
        foreach (var descendant in query)
        {
          itemIds.Add(descendant.ItemId.ToString());
        }
      }
    }
  }

  foreach (var itemId in itemIds)
  {
    if (cache != null)
    {
      cache.RemoveKeysContaining(itemId.ToUpperInvariant());
    }
    if (ignore_cache != null)
    {
      ignore_cache.RemoveKeysContaining(itemId.ToUpperInvariant());
    }
  }
}

private string SanitizePath(string path)
{
  var parts = path.Split('/');
  return string.Join("/", parts.Select(p => p.Contains("-") ? ("#" + p + "#") : p));
}

#endregion

#region Initializers

private void InitializeEventHandlers(Database database)
{
  var dataEngine = database.Engines.DataEngine;
  dataEngine.DeletedItem += DataEngine_DeletedItem;
  dataEngine.SavedItem += DataEngine_SavedItem;
  dataEngine.RemovedVersion += DataEngine_RemoveVersion;
  EventManager.Subscribe<PublishEndRemoteEvent>(@event => ClearFallbackCaches(@event, database));
}