Moving back TaskScheduler but marking it with [Obsolete (false)] which enables soft migration to future versions.

Author: Scooletz

projects/client/RabbitMQ.Client/src/client/api/ConnectionFactory.cs

@@ -238,6 +238,7 @@ public TimeSpan ContinuationTimeout
         /// Task scheduler connections created by this factory will use when
         /// dispatching consumer operations, such as message deliveries.
         /// </summary>
+        [Obsolete("This scheduler is no longer used for dispatching consumer operations and will be removed in the next major version.", false)]
         public TaskScheduler TaskScheduler { get; set; } = TaskScheduler.Default;
 
         /// <summary>

projects/client/RabbitMQ.Client/src/client/api/IConnectionFactory.cs

@@ -128,6 +128,14 @@ public interface IConnectionFactory
         /// <returns></returns>
         IConnection CreateConnection(IList<string> hostnames, String clientProvidedName);
 
+        /// <summary>
+        /// Advanced option.
+        ///
+        /// What task scheduler should consumer dispatcher use.
+        /// </summary>
+        [Obsolete("This scheduler is no longer used for dispatching consumer operations and will be removed in the next major version.", false)]
+        TaskScheduler TaskScheduler { get; set; }
+
         /// <summary>
         /// Amount of time protocol handshake operations are allowed to take before
         /// timing out.