Fix multiple intro providers and remove unneeded ToLists (#11431)

Emby.Server.Implementations/Library/LibraryManager.cs

@@ -44,7 +44,6 @@ using MediaBrowser.Model.Library;
 using MediaBrowser.Model.Querying;
 using MediaBrowser.Model.Tasks;
 using Microsoft.Extensions.Logging;
-using TMDbLib.Objects.Authentication;
 using Episode = MediaBrowser.Controller.Entities.TV.Episode;
 using EpisodeInfo = Emby.Naming.TV.EpisodeInfo;
 using Genre = MediaBrowser.Controller.Entities.Genre;
@@ -1612,14 +1611,18 @@ namespace Emby.Server.Implementations.Library
         /// <returns>IEnumerable{System.String}.</returns>
         public async Task<IEnumerable<Video>> GetIntros(BaseItem item, User user)
         {
+            if (IntroProviders.Length == 0)
+            {
+                return [];
+            }
+
             var tasks = IntroProviders
-                .Take(1)
                 .Select(i => GetIntros(i, item, user));
 
             var items = await Task.WhenAll(tasks).ConfigureAwait(false);
 
             return items
-                .SelectMany(i => i.ToArray())
+                .SelectMany(i => i)
                 .Select(ResolveIntro)
                 .Where(i => i is not null)!; // null values got filtered out
         }

Emby.Server.Implementations/Library/MediaSourceManager.cs

@@ -274,7 +274,7 @@ namespace Emby.Server.Implementations.Library
             var tasks = _providers.Select(i => GetDynamicMediaSources(item, i, cancellationToken));
             var results = await Task.WhenAll(tasks).ConfigureAwait(false);
 
-            return results.SelectMany(i => i.ToList());
+            return results.SelectMany(i => i);
         }
 
         private async Task<IEnumerable<MediaSourceInfo>> GetDynamicMediaSources(BaseItem item, IMediaSourceProvider provider, CancellationToken cancellationToken)

MediaBrowser.Providers/Manager/ProviderManager.cs

@@ -286,7 +286,7 @@ namespace MediaBrowser.Providers.Manager
 
             var results = await Task.WhenAll(tasks).ConfigureAwait(false);
 
-            return results.SelectMany(i => i.ToList());
+            return results.SelectMany(i => i);
         }
 
         /// <summary>