refactor<*>: rewrite all with AvaloniaUI

src/ViewModels/Cleanup.cs

@@ -0,0 +1,30 @@
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels {
+    public class Cleanup : Popup {
+        public Cleanup(Repository repo) {
+            _repo = repo;
+            View = new Views.Cleanup() { DataContext = this };
+        }
+
+        public override Task<bool> Sure() {
+            _repo.SetWatcherEnabled(false);
+            ProgressDescription = "Cleanup (GC & prune) ...";
+            return Task.Run(() => {
+                SetProgressDescription("Run GC ...");
+                new Commands.GC(_repo.FullPath, SetProgressDescription).Exec();
+
+                var lfs = new Commands.LFS(_repo.FullPath);
+                if (lfs.IsEnabled()) {
+                    SetProgressDescription("Run LFS prune ...");
+                    lfs.Prune(SetProgressDescription);
+                }
+
+                CallUIThread(() => _repo.SetWatcherEnabled(true));
+                return true;
+            });
+        }
+
+        private Repository _repo = null;
+    }
+}