Tweak name from `PeekPing` to `DequeueUnsentPing`, to better reflect what it...

Tweak name from `PeekPing` to `DequeueUnsentPing`, to better reflect what it is doing; fix the remaining count accordingly

StackExchange.Redis/StackExchange/Redis/MessageQueue.cs

@@ -27,20 +27,25 @@ public Message Dequeue()
             return null;
         }
 
-        public Message PeekPing(out int queueLength)
+        /// <summary>
+        /// Checks both high-pri and regular queues to see if the next item is a PING, and if so: dequeues it and returns it
+        /// </summary>
+        public Message DequeueUnsentPing(out int queueLength)
         {
             lock (regular)
             {
                 Message peeked;
                 queueLength = high.Count + regular.Count;
+                //In a disconnect scenario, we don't want to complete the Ping message twice,
+                //dequeue it now so it wont get dequeued in AbortUnsent (if we're going down that code path)
                 if (high.Count != 0 && (peeked = high.Peek()).Command == RedisCommand.PING)
                 {
-                    //In a disconnect scenario, we don't want to complete the Ping message twice,
-                    //dequeue it now so it wont get dequeued in AbortUnsent (if we're going down that code path)
+                    queueLength--;
                     return high.Dequeue();
                 }
                 if (regular.Count != 0 && (peeked = regular.Peek()).Command == RedisCommand.PING)
                 {
+                    queueLength--;
                     return regular.Dequeue();
                 }
             }

StackExchange.Redis/StackExchange/Redis/PhysicalBridge.cs

@@ -316,7 +316,7 @@ internal void OnDisconnected(ConnectionFailureType failureType, PhysicalConnecti
 
             // if the next thing in the pipe is a PING, we can tell it that we failed (this really helps spot doomed connects)
             int count;
-            var ping = queue.PeekPing(out count);
+            var ping = queue.DequeueUnsentPing(out count);
             if (ping != null)
             {
                 Trace("Marking PING as failed (queue length: " + count + ")");