[Deps]Upgrade WpfUI to preview.9 and fix Windows 10 background issue (#29884)

* Bumping to preview9

Directory.Packages.props

@@ -74,7 +74,7 @@
     <PackageVersion Include="Vanara.PInvoke.User32" Version="3.4.11" />
     <PackageVersion Include="Vanara.PInvoke.Shell32" Version="3.4.11" />
     <PackageVersion Include="WinUIEx" Version="2.2.0" />
-    <PackageVersion Include="WPF-UI" Version="3.0.0-preview.4" />
+    <PackageVersion Include="WPF-UI" Version="3.0.0-preview.9" />
   </ItemGroup>
   <ItemGroup Condition="'$(IsExperimentationLive)'!=''">
     <!-- Additional dependencies used by experimentation -->

NOTICE.md

@@ -1332,5 +1332,5 @@ EXHIBIT A -Mozilla Public License.
 - Vanara.PInvoke.Shell32 3.4.11
 - Vanara.PInvoke.User32 3.4.11
 - WinUIEx 2.2.0
-- WPF-UI 3.0.0-preview.4
+- WPF-UI 3.0.0-preview.9
 

src/common/Common.UI/OSVersionHelper.cs

@@ -0,0 +1,16 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+
+namespace Common.UI
+{
+    public static class OSVersionHelper
+    {
+        public static bool IsWindows11()
+        {
+            return Environment.OSVersion.Version.Major >= 10 && Environment.OSVersion.Version.Build >= 22000;
+        }
+    }
+}

src/modules/imageresizer/ui/Views/MainWindow.xaml

@@ -16,7 +16,6 @@
     ExtendsContentIntoTitleBar="True"
     Icon="/PowerToys.ImageResizer;component/Resources/ImageResizer.ico"
     ResizeMode="NoResize"
-    WindowBackdropType="Mica"
     WindowCornerPreference="Default"
     WindowStartupLocation="CenterScreen">
 

src/modules/imageresizer/ui/Views/MainWindow.xaml.cs

@@ -5,6 +5,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Common.UI;
 using ImageResizer.ViewModels;
 using Microsoft.Win32;
 using Wpf.Ui.Controls;
@@ -17,7 +18,17 @@ namespace ImageResizer.Views
         public MainWindow(MainViewModel viewModel)
         {
             DataContext = viewModel;
-            Wpf.Ui.Appearance.Watcher.Watch(this);
+            Wpf.Ui.Appearance.SystemThemeWatcher.Watch(this);
+
+            if (OSVersionHelper.IsWindows11())
+            {
+                WindowBackdropType = WindowBackdropType.Mica;
+            }
+            else
+            {
+                WindowBackdropType = WindowBackdropType.None;
+            }
+
             InitializeComponent();
         }
 

src/settings-ui/Settings.UI.Library/Utilities/Helper.cs

@@ -150,10 +150,5 @@ namespace Microsoft.PowerToys.Settings.UI.Library.Utilities
         }
 
         public const uint VirtualKeyWindows = interop.Constants.VK_WIN_BOTH;
-
-        public static bool Windows11()
-        {
-            return Environment.OSVersion.Version.Major >= 10 && Environment.OSVersion.Version.Build >= 22000;
-        }
     }
 }

src/settings-ui/Settings.UI/ViewModels/AlwaysOnTopViewModel.cs

@@ -6,6 +6,7 @@ using System;
 using System.Globalization;
 using System.Runtime.CompilerServices;
 using System.Text.Json;
+using Common.UI;
 using global::PowerToys.GPOWrapper;
 using Microsoft.PowerToys.Settings.UI.Library;
 using Microsoft.PowerToys.Settings.UI.Library.Helpers;
@@ -61,7 +62,7 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
             _doNotActivateOnGameMode = Settings.Properties.DoNotActivateOnGameMode.Value;
             _roundCornersEnabled = Settings.Properties.RoundCornersEnabled.Value;
             _excludedApps = Settings.Properties.ExcludedApps.Value;
-            _windows11 = Helper.Windows11();
+            _windows11 = OSVersionHelper.IsWindows11();
 
             // set the callback functions value to handle outgoing IPC message.
             SendConfigMSG = ipcMSGCallBackFunc;

src/settings-ui/Settings.UI/ViewModels/FancyZonesViewModel.cs

@@ -4,6 +4,7 @@
 
 using System;
 using System.Runtime.CompilerServices;
+using Common.UI;
 using global::PowerToys.GPOWrapper;
 using Microsoft.PowerToys.Settings.UI.Library;
 using Microsoft.PowerToys.Settings.UI.Library.Helpers;
@@ -119,7 +120,7 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
 
             InitializeEnabledValue();
 
-            _windows11 = Helper.Windows11();
+            _windows11 = OSVersionHelper.IsWindows11();
 
             // Disable setting on windows 10
             if (!_windows11 && DisableRoundCornersOnWindowSnap)

src/settings-ui/Settings.UI/ViewModels/Flyout/FlyoutViewModel.cs

@@ -6,6 +6,7 @@ using System;
 using System.ComponentModel;
 using System.Runtime.CompilerServices;
 using System.Timers;
+using Common.UI;
 using Microsoft.PowerToys.Settings.UI.Library.Utilities;
 
 namespace Microsoft.PowerToys.Settings.UI.ViewModels.Flyout
@@ -39,7 +40,7 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels.Flyout
             _hideTimer.Elapsed += HideTimer_Elapsed;
             _hideTimer.Interval = 1000;
             _hideTimer.Enabled = false;
-            _windows10 = !Helper.Windows11();
+            _windows10 = !OSVersionHelper.IsWindows11();
         }
 
         private void HideTimer_Elapsed(object sender, ElapsedEventArgs e)