refactor<*>: rewrite all with AvaloniaUI

src/ViewModels/DeleteBranch.cs

@@ -0,0 +1,32 @@
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels {
+    public class DeleteBranch : Popup {
+        public Models.Branch Target {
+            get;
+            private set;
+        }
+
+        public DeleteBranch(Repository repo, Models.Branch branch) {
+            _repo = repo;
+            Target = branch;
+            View = new Views.DeleteBranch() { DataContext = this };
+        }
+
+        public override Task<bool> Sure() {
+            _repo.SetWatcherEnabled(false);
+            return Task.Run(() => {
+                if (Target.IsLocal) {
+                    Commands.Branch.Delete(_repo.FullPath, Target.Name);
+                } else {
+                    new Commands.Push(_repo.FullPath, Target.Remote, Target.Name).Exec();
+                }
+
+                CallUIThread(() => _repo.SetWatcherEnabled(true));
+                return true;
+            });
+        }
+
+        private Repository _repo = null;
+    }
+}