Fix navigation to outdated comments

Navigate to file at commit where comment was orignally added.

Author: jcansdale

src/GitHub.App/ViewModels/GitHubPane/PullRequestReviewCommentViewModel.cs

@@ -52,7 +52,8 @@ async Task DoOpen()
             {
                 if (thread == null)
                 {
-                    var file = await session.GetFile(RelativePath, model.Thread.CommitSha);
+                    var sha = model.Thread.IsOutdated ? model.Thread.OriginalCommitSha : model.Thread.CommitSha;
+                    var file = await session.GetFile(RelativePath, sha);
                     thread = file.InlineCommentThreads.FirstOrDefault(t => t.Comments.Any(c => c.Comment.Id == model.Id));
                 }
 

src/GitHub.InlineReviews/Services/PullRequestSessionService.cs

@@ -116,7 +116,7 @@ public IReadOnlyList<IInlineCommentThreadModel> BuildCommentThreads(
             relativePath = relativePath.Replace("\\", "/");
 
             var threadsByPosition = pullRequest.Threads
-                .Where(x => x.Path == relativePath && !x.IsOutdated)
+                .Where(x => x.Path == relativePath)
                 .OrderBy(x => x.Id)
                 .GroupBy(x => Tuple.Create(x.OriginalCommitSha, x.OriginalPosition));
             var threads = new List<IInlineCommentThreadModel>();