enhance: save preference.json instantly

src/App.axaml.cs

@@ -522,7 +522,6 @@ namespace SourceGit
             var pref = ViewModels.Preference.Instance;
             if (pref.ShouldCheck4UpdateOnStartup())
             {
-                pref.Save();
                 Check4Update();
             }
         }

src/ViewModels/Preference.cs

@@ -1,9 +1,11 @@
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.IO;
 using System.Text.Json;
 using System.Text.Json.Serialization;
-
+using System.Threading;
+using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.ComponentModel;
 
 namespace SourceGit.ViewModels
@@ -414,10 +416,44 @@ namespace SourceGit.ViewModels
 
         public void Save()
         {
+            lock (_saveCtsLock)
+            {
+                _saveCts.Cancel();
+                _saveCts = new CancellationTokenSource();
+            }
             var data = JsonSerializer.Serialize(this, JsonCodeGen.Default.Preference);
             File.WriteAllText(_savePath, data);
         }
 
+        public async Task SaveAsync()
+        {
+            lock (_saveCtsLock)
+            {
+                _saveCts.Cancel();
+                _saveCts = new CancellationTokenSource();
+            }
+
+            try
+            {
+                await Task.Delay(3000, _saveCts.Token);
+            }
+            catch (TaskCanceledException)
+            {
+                return;
+            }
+
+            var data = JsonSerializer.Serialize(this, JsonCodeGen.Default.Preference);
+            await File.WriteAllTextAsync(_savePath, data);
+        }
+
+        protected override void OnPropertyChanged(PropertyChangedEventArgs e)
+        {
+            base.OnPropertyChanged(e);
+#pragma warning disable CS4014
+            SaveAsync();
+#pragma warning restore CS4014
+        }
+
         private RepositoryNode FindNodeRecursive(string id, List<RepositoryNode> collection)
         {
             foreach (var node in collection)
@@ -468,6 +504,8 @@ namespace SourceGit.ViewModels
         private static Preference _instance = null;
         private static bool _isLoading = false;
         private static readonly string _savePath = Path.Combine(Native.OS.DataDir, "preference.json");
+        private static CancellationTokenSource _saveCts = new();
+        private static readonly object _saveCtsLock = new();
 
         private string _locale = "en_US";
         private string _theme = "Default";

src/Views/Preference.axaml.cs

@@ -261,7 +261,9 @@ namespace SourceGit.Views
             if (sender is CheckBox box)
             {
                 ViewModels.Preference.Instance.UseSystemWindowFrame = box.IsChecked == true;
-                ViewModels.Preference.Instance.Save();
+#pragma warning disable CS4014
+                ViewModels.Preference.Instance.SaveAsync();
+#pragma warning restore CS4014
 
                 var dialog = new ConfirmRestart();
                 App.OpenDialog(dialog);