Fixed: Already imported downloads appearing in Queue briefly

(cherry picked from commit 8099ba10afded446779290de29b1baaf0be932c3)

Closes #3538

src/NzbDrone.Core.Test/QueueTests/QueueServiceFixture.cs

@@ -46,6 +46,7 @@ namespace NzbDrone.Core.Test.QueueTests
 
             _trackedDownloads = Builder<TrackedDownload>.CreateListOfSize(1)
                 .All()
+                .With(v => v.IsTrackable = true)
                 .With(v => v.DownloadItem = downloadItem)
                 .With(v => v.RemoteBook = remoteBook)
                 .Build()

src/NzbDrone.Core/Queue/QueueService.cs

@@ -20,7 +20,7 @@ namespace NzbDrone.Core.Queue
     public class QueueService : IQueueService, IHandle<TrackedDownloadRefreshedEvent>
     {
         private readonly IEventAggregator _eventAggregator;
-        private static List<Queue> _queue = new List<Queue>();
+        private static List<Queue> _queue = new ();
         private readonly IHistoryService _historyService;
 
         public QueueService(IEventAggregator eventAggregator,
@@ -105,8 +105,11 @@ namespace NzbDrone.Core.Queue
 
         public void Handle(TrackedDownloadRefreshedEvent message)
         {
-            _queue = message.TrackedDownloads.OrderBy(c => c.DownloadItem.RemainingTime).SelectMany(MapQueue)
-                            .ToList();
+            _queue = message.TrackedDownloads
+                .Where(t => t.IsTrackable)
+                .OrderBy(c => c.DownloadItem.RemainingTime)
+                .SelectMany(MapQueue)
+                .ToList();
 
             _eventAggregator.PublishEvent(new QueueUpdatedEvent());
         }