Fixed: Trigger fewer signalr broadcasts

src/NzbDrone.Core/MediaCover/MediaCoverService.cs

@@ -90,6 +90,7 @@ namespace NzbDrone.Core.MediaCover
 
         private void EnsureCovers(Movie movie)
         {
+            bool updated = false;
             var toResize = new List<Tuple<MediaCover, bool>>();
 
             foreach (var cover in movie.Images)
@@ -102,6 +103,7 @@ namespace NzbDrone.Core.MediaCover
                     if (!alreadyExists)
                     {
                         DownloadCover(movie, cover);
+                        updated = true;
                     }
                 }
                 catch (WebException e)
@@ -129,6 +131,8 @@ namespace NzbDrone.Core.MediaCover
             {
                 _semaphore.Release();
             }
+
+            return updated;
         }
 
         private void DownloadCover(Movie movie, MediaCover cover)
@@ -186,9 +190,12 @@ namespace NzbDrone.Core.MediaCover
 
         public void HandleAsync(MovieUpdatedEvent message)
         {
-            EnsureCovers(message.Movie);
+            var updated = EnsureCovers(message.Movie);
+            if (updated)
+            {
                 _eventAggregator.PublishEvent(new MediaCoversUpdatedEvent(message.Movie));
             }
+        }
 
         public void HandleAsync(MovieDeletedEvent message)
         {

src/NzbDrone.Core/Movies/RefreshMovieService.cs

@@ -136,7 +136,7 @@ namespace NzbDrone.Core.Movies
                 _logger.Info(ex, "Unable to communicate with Mappings Server.");
             }
 
-            _movieService.UpdateMovie(movie);
+            _movieService.UpdateMovie(new List<Movie> { movie });
 
             try
             {