enhance: manually update local branch tree after checking out and fast-forward a exiting local branch (#2169)

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

Author: love-linger

src/ViewModels/CheckoutAndFastForward.cs

@@ -80,17 +80,19 @@ public override async Task<bool> Sure()
                     await new Commands.Stash(_repo.FullPath)
                         .Use(log)
                         .PopAsync("stash@{0}");
-            }
-
-            log.Complete();
 
-            if (_repo.HistoryFilterMode == Models.FilterMode.Included)
-                _repo.SetBranchFilterMode(LocalBranch, Models.FilterMode.Included, false, false);
+                LocalBranch.Behind.Clear();
+                LocalBranch.Head = RemoteBranch.Head;
+                LocalBranch.CommitterDate = RemoteBranch.CommitterDate;
 
-            _repo.MarkBranchesDirtyManually();
+                _repo.FastRefreshBranchesAfterCheckout(LocalBranch);
+            }
+            else
+            {
+                _repo.MarkWorkingCopyDirtyManually();
+            }
 
-            ProgressDescription = "Waiting for branch updated...";
-            await Task.Delay(400);
+            log.Complete();
             return succ;
         }