Fix issue that mainVM fails to work

Author: Jack251970

Flow.Launcher/App.xaml.cs

@@ -135,6 +135,7 @@ await Stopwatch.NormalAsync("|App.OnStartup|Startup cost", async () =>
                 await imageLoadertask;
 
                 var mainVM = Ioc.Default.GetRequiredService<MainViewModel>();
+                ((PublicAPIInstance)API).Initialize(mainVM);
                 var window = new MainWindow(_settings, mainVM);
 
                 Log.Info($"|App.OnStartup|Dependencies Info:{ErrorReporting.DependenciesInfo()}");

Flow.Launcher/PublicAPIInstance.cs

@@ -34,18 +34,23 @@ namespace Flow.Launcher
     public class PublicAPIInstance : IPublicAPI
     {
         private readonly Settings _settings;
-        private readonly MainViewModel _mainVM;
+        private MainViewModel _mainVM;
 
-        #region Constructor
+        #region Constructor & Initialization
 
-        public PublicAPIInstance(Settings settings, MainViewModel mainVM)
+        public PublicAPIInstance(Settings settings)
         {
             _settings = settings;
-            _mainVM = mainVM;
             GlobalHotkey.hookedKeyboardCallback = KListener_hookedKeyboardCallback;
             WebRequest.RegisterPrefix("data", new DataWebRequestFactory());
         }
 
+        // We must initialize mainVM later to avoid unknown issue that _mainVM fails to work
+        public void Initialize(MainViewModel mainVM)
+        {
+            _mainVM = mainVM;
+        }
+
         #endregion
 
         #region Public API