Some windows do not have menu items. Fixed.

Author: AlexanderPro

SmartSystemMenu/EnumWindows.cs

@@ -46,11 +46,6 @@ public static IList<Window> EnumProcessWindows(int processId, IntPtr[] filterHan
 
         private static bool EnumWindowCallback(IntPtr hwnd, int lParam)
         {
-            if (!NativeMethods.IsWindowVisible(hwnd))
-            {
-                return true;
-            }
-
             if (_filterHandles.Any(h => h == hwnd))
             {
                 return true;

SmartSystemMenu/Forms/MainForm.cs

@@ -299,7 +299,7 @@ private void MenuItemExitClick(object sender, EventArgs e)
 
         private void WindowCreated(object sender, WindowEventArgs e)
         {
-            if (e.Handle != IntPtr.Zero && NativeMethods.IsWindowVisible(e.Handle) && !_windows.Any(w => w.Handle == e.Handle))
+            if (e.Handle != IntPtr.Zero && new SystemMenu(e.Handle, _settings.MenuItems, _settings.LanguageSettings).Exists && !_windows.Any(w => w.Handle == e.Handle))
             {
                 NativeMethods.GetWindowThreadProcessId(e.Handle, out int processId);
                 IList<Window> windows = new List<Window>();