refactor<*>: rewrite all with AvaloniaUI

src/ViewModels/AssumeUnchangedManager.cs

@@ -0,0 +1,30 @@
+using Avalonia.Collections;
+using Avalonia.Threading;
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels {
+    public class AssumeUnchangedManager {
+        public AvaloniaList<string> Files { get; private set; }
+
+        public AssumeUnchangedManager(string repo) {
+            _repo = repo;
+            Files = new AvaloniaList<string>();
+
+            Task.Run(() => {
+                var collect = new Commands.AssumeUnchanged(_repo).View();
+                Dispatcher.UIThread.Invoke(() => {
+                    Files.AddRange(collect);
+                });
+            });
+        }
+
+        public void Remove(object param) {
+            if (param is string file) {
+                new Commands.AssumeUnchanged(_repo).Remove(file);
+                Files.Remove(file);
+            }
+        }
+
+        private string _repo;
+    }
+}