refactor<*>: rewrite all with AvaloniaUI

src/ViewModels/DeleteTag.cs

@@ -0,0 +1,35 @@
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels {
+    public class DeleteTag : Popup {
+        public Models.Tag Target {
+            get;
+            private set;
+        }
+
+        public bool ShouldPushToRemote {
+            get;
+            set;
+        }
+
+        public DeleteTag(Repository repo, Models.Tag tag) {
+            _repo = repo;
+            Target = tag;
+            ShouldPushToRemote = true;
+            View = new Views.DeleteTag() { DataContext = this };
+        }
+
+        public override Task<bool> Sure() {
+            _repo.SetWatcherEnabled(false);
+            return Task.Run(() => {
+                SetProgressDescription($"Deleting tag '{Target.Name}' ...");
+                var remotes = ShouldPushToRemote ? _repo.Remotes : null;
+                var succ = Commands.Tag.Delete(_repo.FullPath, Target.Name, remotes);
+                CallUIThread(() => _repo.SetWatcherEnabled(true));
+                return succ;
+            });
+        }
+
+        private Repository _repo = null;
+    }
+}