code_review: PR #1180

- replace `SetNeedNavigateToUpstreamHead` with `NavigateToBranchDelayed`
- navigate to current HEAD instead of original source HEAD after merge

Signed-off-by: leo <longshuang@msn.cn>

src/ViewModels/FetchInto.cs

@@ -34,7 +34,7 @@ namespace SourceGit.ViewModels
                 new Commands.Fetch(_repo.FullPath, Local, Upstream, SetProgressDescription).Exec();
                 CallUIThread(() =>
                 {
-                    _repo.SetNeedNavigateToUpstreamHead();
+                    _repo.NavigateToBranchDelayed(Upstream.FullName);
                     _repo.SetWatcherEnabled(true);
                 });
                 return true;