com.unity.ide.visualstudio@2.0.2

## [2.0.2] - 2020-05-27

Added support for solution folders.
Only bind the messenger when the VS editor is selected.
Warn when unable to create the messenger.
Fixed an initialization issue triggering legacy code generation.
Allow package source in assembly to be generated when referenced from asmref.

Editor/VisualStudioIntegration.cs

@@ -6,6 +6,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Net;
+using System.Net.Sockets;
 using Microsoft.Unity.VisualStudio.Editor.Messaging;
 using UnityEditor;
 using UnityEngine;
@@ -21,14 +22,27 @@ namespace Microsoft.Unity.VisualStudio.Editor
 		private static readonly Queue<Message> Incoming = new Queue<Message>();
 		private static readonly object IncomingLock = new object();
 
-		public static Application.LogCallback LogCallback = delegate { };
-
 		static VisualStudioIntegration()
 		{
+			if (!VisualStudioEditor.IsEnabled)
+				return;
+
 			RunOnceOnUpdate(() =>
 			{
-				_messager = Messager.BindTo(MessagingPort());
-				_messager.ReceiveMessage += ReceiveMessage;
+				// Despite using ReuseAddress|!ExclusiveAddressUse, we can fail here:
+				// - if another application is using this port with exclusive access
+				// - or if the firewall is not properly configured
+				var messagingPort = MessagingPort();
+				
+				try {
+					_messager = Messager.BindTo(messagingPort);
+					_messager.ReceiveMessage += ReceiveMessage;
+				}
+				catch (SocketException)
+				{
+					// We'll have a chance to try to rebind on next domain reload
+					Debug.LogWarning($"Unable to use UDP port {messagingPort} for VS/Unity messaging. You should check if another process is already bound to this port or if your firewall settings are compatible.");
+				}
 
 				RunOnShutdown(Shutdown);
 			});