Don't worry about auto-disposing

PullRequestDetailViewModel will be disposed in future commit.

Author: jcansdale

src/GitHub.App/ViewModels/PullRequestDetailViewModel.cs

@@ -76,7 +76,6 @@ public sealed class PullRequestDetailViewModel : PanePageViewModelBase, IPullReq
         {
             this.vsGitExt = vsGitExt;
 
-            AutoDispose.DisposePrevious(this);
             vsGitExt.ActiveRepositoriesChanged += Refresh;
         }
 
@@ -85,18 +84,6 @@ public void Dispose()
             vsGitExt.ActiveRepositoriesChanged -= Refresh;
         }
 
-        // HACK: This is a workaround for models not being automatically disposed.
-        static class AutoDispose
-        {
-            static IDisposable previous;
-
-            internal static void DisposePrevious(IDisposable disposable)
-            {
-                previous?.Dispose();
-                previous = disposable;
-            }
-        }
-
         /// <summary>
         /// Initializes a new instance of the <see cref="PullRequestDetailViewModel"/> class.
         /// </summary>