fix: sometimes tags did not update after deleting selected tag (#908)

src/Models/Watcher.cs

@@ -72,6 +72,11 @@ namespace SourceGit.Models
             _updateBranch = DateTime.Now.ToFileTime() - 1;
         }
 
+        public void MarkTagDirtyManually()
+        {
+            _updateTags = DateTime.Now.ToFileTime() - 1;
+        }
+
         public void MarkWorkingCopyDirtyManually()
         {
             _updateWC = DateTime.Now.ToFileTime() - 1;

src/ViewModels/DeleteTag.cs

@@ -33,7 +33,11 @@ namespace SourceGit.ViewModels
             {
                 var remotes = ShouldPushToRemote ? _repo.Remotes : null;
                 var succ = Commands.Tag.Delete(_repo.FullPath, Target.Name, remotes);
-                CallUIThread(() => _repo.SetWatcherEnabled(true));
+                CallUIThread(() =>
+                {
+                    _repo.MarkTagsDirtyManually();
+                    _repo.SetWatcherEnabled(true);
+                });
                 return succ;
             });
         }

src/ViewModels/Repository.cs

@@ -771,6 +771,19 @@ namespace SourceGit.ViewModels
             }
         }
 
+        public void MarkTagsDirtyManually()
+        {
+            if (_watcher == null)
+            {
+                Task.Run(RefreshTags);
+                Task.Run(RefreshCommits);
+            }
+            else
+            {
+                _watcher.MarkTagDirtyManually();
+            }
+        }
+
         public void MarkWorkingCopyDirtyManually()
         {
             if (_watcher == null)