Make GitService.Refresh the CurrentBranch

Previously CurrentBranch was created as the property was read. We now
need a way to refresh it.

Author: jcansdale

src/GitHub.Exports/Models/ILocalRepositoryModel.cs

@@ -15,6 +15,6 @@ public interface ILocalRepositoryModel : IRepositoryModel, INotifyPropertyChange
         /// <summary>
         /// Gets the current branch.
         /// </summary>
-        IBranch CurrentBranch { get; }
+        IBranch CurrentBranch { get; set; }
     }
 }

src/GitHub.Exports/Services/GitService.cs

@@ -55,7 +55,7 @@ public ILocalRepositoryModel CreateLocalRepositoryModel(string localPath)
         }
 
         /// <summary>
-        /// Updates the CloneUrl from the local repository.
+        /// Updates the CloneUrl and CurrentBranch from the local repository.
         /// </summary>
         public void Refresh(ILocalRepositoryModel localRepositoryModel)
         {
@@ -64,6 +64,8 @@ public void Refresh(ILocalRepositoryModel localRepositoryModel)
                 return;
 
             localRepositoryModel.CloneUrl = GetUri(localPath);
+
+            RefreshCurrentBranch(localRepositoryModel);
         }
 
         /// <summary>
@@ -199,7 +201,7 @@ public Task<string> GetLatestPushedSha(string path, string remote = "origin")
             });
         }
 
-        void RefreshCurrentBranch(LocalRepositoryModel model)
+        void RefreshCurrentBranch(ILocalRepositoryModel model)
         {
             var localPath = model.LocalPath;
             using (var repo = GetRepository(localPath))