fix(vsix): RemoteControl.VS throw exception during VS closing.

Author: workgroupengineering

src/Uno.UI.RemoteControl.VS/EntryPoint.cs

@@ -39,6 +39,7 @@ public class EntryPoint
 		private System.Diagnostics.Process _process;
 
 		private int RemoteControlServerPort;
+		private bool _closing = false;
 
 		public EntryPoint(DTE2 dte2, string toolsPath, AsyncPackage asyncPackage, Action<Func<Task<Dictionary<string, string>>>> globalPropertiesProvider)
 		{
@@ -96,12 +97,36 @@ private void SetupOutputWindow()
 				.Add(UnoPlatformOutputPane);
 			}
 
-			_debugAction = s => owPane.OutputString("[DEBUG] " + s + "\r\n");
-			_infoAction = s => owPane.OutputString("[INFO] " + s + "\r\n");
-			_infoAction = s => owPane.OutputString("[INFO] " + s + "\r\n");
-			_verboseAction = s => owPane.OutputString("[VERBOSE] " + s + "\r\n");
-			_warningAction = s => owPane.OutputString("[WARNING] " + s + "\r\n");
-			_errorAction = e => owPane.OutputString("[ERROR] " + e + "\r\n");
+			_debugAction = s => {
+				if (!_closing)
+				{
+					owPane.OutputString("[DEBUG] " + s + "\r\n");
+				}
+			};
+			_infoAction = s => {
+				if (!_closing)
+				{
+					owPane.OutputString("[INFO] " + s + "\r\n");
+				}
+			};
+			_verboseAction = s => {
+				if (!_closing)
+				{
+					owPane.OutputString("[VERBOSE] " + s + "\r\n");
+				}
+			};
+			_warningAction = s => {
+				if (!_closing)
+				{
+					owPane.OutputString("[WARNING] " + s + "\r\n");
+				}
+			};
+			_errorAction = e => {
+				if (!_closing)
+				{
+					owPane.OutputString("[ERROR] " + e + "\r\n");
+				}
+			};
 
 			_infoAction($"Uno Remote Control initialized ({GetAssemblyVersion()})");
 		}
@@ -171,6 +196,7 @@ private async Task SolutionEvents_BeforeClosingAsync()
 				}
 				finally
 				{
+					_closing = true;
 					_process = null;
 				}
 			}