Fixed: Task progress messages in the UI

(cherry picked from commit c6417337812f3578a27f9dc1e44fdad80f557271)

src/NzbDrone.Core/Applications/ApplicationIndexerSyncCommand.cs

@@ -13,6 +13,6 @@ namespace NzbDrone.Core.Applications
 
         public override bool SendUpdatesToClient => true;
 
-        public override string CompletionMessage => null;
+        public override string CompletionMessage => "Completed";
     }
 }

src/NzbDrone.Core/IndexerSearch/ReleaseSearchService.cs

@@ -196,7 +196,7 @@ namespace NzbDrone.Core.IndexerSearch
 
             var reports = batch.SelectMany(x => x).ToList();
 
-            _logger.Debug("Total of {0} reports were found for {1} from {2} indexer(s)", reports.Count, criteriaBase, indexers.Count);
+            _logger.ProgressDebug("Total of {0} reports were found for {1} from {2} indexer(s)", reports.Count, criteriaBase, indexers.Count);
 
             return reports;
         }

src/NzbDrone.Core/Messaging/Commands/Command.cs

@@ -23,7 +23,7 @@ namespace NzbDrone.Core.Messaging.Commands
         }
 
         public virtual bool UpdateScheduledTask => true;
-        public virtual string CompletionMessage => "Completed";
+        public virtual string CompletionMessage => null;
         public virtual bool RequiresDiskAccess => false;
         public virtual bool IsExclusive => false;
         public virtual bool IsTypeExclusive => false;

src/NzbDrone.Core/ProgressMessaging/ProgressMessageContext.cs

@@ -1,10 +1,13 @@
-using System;
+using System;
+using System.Threading;
 using NzbDrone.Core.Messaging.Commands;
 
 namespace NzbDrone.Core.ProgressMessaging
 {
     public static class ProgressMessageContext
     {
+        private static AsyncLocal<CommandModel> _commandModelAsync = new AsyncLocal<CommandModel>();
+
         [ThreadStatic]
         private static CommandModel _commandModel;
 
@@ -13,8 +16,15 @@ namespace NzbDrone.Core.ProgressMessaging
 
         public static CommandModel CommandModel
         {
-            get { return _commandModel; }
+            get
-            set { _commandModel = value; }
+            {
+                return _commandModel ?? _commandModelAsync.Value;
+            }
+            set
+            {
+                _commandModel = value;
+                _commandModelAsync.Value = value;
+            }
         }
 
         public static bool LockReentrancy()

src/NzbDrone.Core/Update/Commands/ApplicationUpdateCommand.cs

@@ -6,7 +6,5 @@ namespace NzbDrone.Core.Update.Commands
     {
         public override bool SendUpdatesToClient => true;
         public override bool IsExclusive => true;
-
-        public override string CompletionMessage => null;
     }
 }