Fix links in inline comments.

src/GitHub.InlineReviews/Views/CommentView.xaml

@@ -32,6 +32,10 @@
         </ResourceDictionary>
     </FrameworkElement.Resources>
 
+    <FrameworkElement.CommandBindings>
+        <CommandBinding Command="{x:Static markdig:Commands.Hyperlink}" Executed="OpenHyperlink" />
+    </FrameworkElement.CommandBindings>
+
     <Grid>
         <!-- Displays an existing comment-->
         <StackPanel Orientation="Vertical" Margin="4">

src/GitHub.InlineReviews/Views/CommentView.xaml.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Windows.Controls;
+using System.Windows.Input;
 using System.Windows.Threading;
 using GitHub.InlineReviews.ViewModels;
 using GitHub.Services;
@@ -23,11 +24,15 @@ public CommentView()
             });
         }
 
-        void DoOpenOnGitHub()
+        IVisualStudioBrowser GetBrowser()
         {
             var serviceProvider = (IGitHubServiceProvider)Package.GetGlobalService(typeof(IGitHubServiceProvider));
-            var browser = serviceProvider.GetService<IVisualStudioBrowser>();
-            browser.OpenUrl(ViewModel.Thread.GetCommentUrl(ViewModel.Id));
+            return serviceProvider.GetService<IVisualStudioBrowser>();
+        }
+
+        void DoOpenOnGitHub()
+        {
+            GetBrowser().OpenUrl(ViewModel.Thread.GetCommentUrl(ViewModel.Id));
         }
 
         private void CommentView_Loaded(object sender, System.Windows.RoutedEventArgs e)
@@ -56,5 +61,15 @@ private void buttonPanel_IsVisibleChanged(object sender, System.Windows.Dependen
                 BringIntoView();
             }
         }
+
+        void OpenHyperlink(object sender, ExecutedRoutedEventArgs e)
+        {
+            Uri uri;
+
+            if (Uri.TryCreate(e.Parameter?.ToString(), UriKind.Absolute, out uri))
+            {
+                GetBrowser().OpenUrl(uri);
+            }
+        }
     }
 }