xamlil compatibility with debugger

AvalonStudio/AvalonStudio.Debugging/DebugManager2.cs

@@ -12,6 +12,7 @@ namespace AvalonStudio.Debugging
     using Mono.Debugging.Client;
     using System;
     using System.Composition;
+    using System.IO;
     using System.Reactive.Linq;
     using System.Xml;
 
@@ -309,7 +310,12 @@ private void _session_TargetStopped(object sender, TargetEventArgs e)
 
                 if (sourceLocation.FileName != null)
                 {
-                    var normalizedPath = sourceLocation.FileName.NormalizePath();
+                    string normalizedPath = sourceLocation.FileName;
+
+                    if(Path.IsPathRooted(sourceLocation.FileName))
+                    {
+                        normalizedPath = sourceLocation.FileName.NormalizePath();
+                    }
 
                     ISourceFile file = null;
 

AvalonStudio/AvalonStudio.Languages.Xaml/AvaloniaPreviewer.cs

@@ -330,16 +330,37 @@ private void OnMessage(IAvaloniaRemoteTransportConnection transport, object obj)
                 {
                     if (result.Error != null)
                     {
-                        _errorText.Text = result.Error;
-                        _showErrors.IsVisible = true;
+                        if (_errorText != null)
+                        {
+                            _errorText.Text = result.Error;
+                        }
+
+                        if (_showErrors != null)
+                        {
+                            _showErrors.IsVisible = true;
+                        }
 
-                        _remote.InError = true;
+                        if (_remote != null)
+                        {
+                            _remote.InError = true;
+                        }
                     }
                     else
                     {
-                        _remote.InError = false;
-                        _showErrors.IsVisible = false;
-                        _errorText.Text = "";
+                        if (_remote != null)
+                        {
+                            _remote.InError = false;
+                        }
+
+                        if (_showErrors != null)
+                        {
+                            _showErrors.IsVisible = false;
+                        }
+
+                        if (_errorText != null)
+                        {
+                            _errorText.Text = "";
+                        }
                     }
                 }
             });