[PTRun]Bring back acrylic and proper fix to title bar accent showing (#33458)

* Revert "[PTRun]Fix accent on title bar bleed into UI (#33046)"

This reverts commit 8bb5a33572.

* Revert "[PTRun]Use Mica backdrop to fix crashes with WPFUI (#32118)"

This reverts commit b9da1e6abf.

* Fix DWMAttributes in Wox Plugin Native Methods

* Fix titlebar accent showing

* Fix number on wrong enum

src/modules/launcher/Plugins/Microsoft.Plugin.WindowWalker/Components/LivePreview.cs

@@ -19,13 +19,13 @@ namespace Microsoft.Plugin.WindowWalker.Components
         /// <param name="hwnd">handle to the window to exclude</param>
         public static void SetWindowExclusionFromLivePreview(IntPtr hwnd)
         {
-            int renderPolicy = (int)DwmNCRenderingPolicies.Enabled;
+            uint renderPolicy = (uint)DwmNCRenderingPolicies.Enabled;
 
             _ = NativeMethods.DwmSetWindowAttribute(
                 hwnd,
                 12,
                 ref renderPolicy,
-                sizeof(int));
+                sizeof(uint));
         }
 
         /// <summary>

src/modules/launcher/PowerLauncher/MainWindow.xaml

@@ -32,9 +32,9 @@
 
     <Grid x:Name="RootGrid" MouseDown="OnMouseDown">
         <!--  We set the background here because the Acrylic can be too translucent / background too bright on Light theme  -->
-        <!--<Grid.Background>
+        <Grid.Background>
             <SolidColorBrush Opacity="0.8" Color="{DynamicResource ApplicationBackgroundColor}" />
-        </Grid.Background>-->
+        </Grid.Background>
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto" />
             <RowDefinition Height="Auto" />
@@ -45,11 +45,6 @@
             Grid.Row="0"
             Padding="12,4,12,3">
             <local:LauncherControl x:Name="SearchBox" />
-            <Border.Background>
-                <!--  Setting the background of the search bar to fix https://github.com/microsoft/PowerToys/issues/30206  -->
-                <!--  The title bar accent would bleed if the option to "Show accent color on title bars and windows borders" is enabled on Windows  -->
-                <SolidColorBrush Opacity="1" Color="{DynamicResource ApplicationBackgroundColor}" />
-            </Border.Background>
         </Border>
 
         <!--  Have to use a Grid instead of a StackPanel for scrolling to work?  -->

src/modules/launcher/PowerLauncher/MainWindow.xaml.cs

@@ -63,7 +63,7 @@ namespace PowerLauncher
 
             if (OSVersionHelper.IsWindows11())
             {
-                WindowBackdropType = Wpf.Ui.Controls.WindowBackdropType.Mica;
+                WindowBackdropType = Wpf.Ui.Controls.WindowBackdropType.Acrylic;
             }
             else
             {

src/modules/launcher/PowerLauncher/ViewModel/MainViewModel.cs

@@ -8,11 +8,13 @@ using System.Collections.ObjectModel;
 using System.Globalization;
 using System.Linq;
 using System.Reflection;
+using System.Runtime.InteropServices;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Input;
+using System.Windows.Interop;
 using System.Windows.Threading;
 using Common.UI;
 using interop;
@@ -1006,6 +1008,36 @@ namespace PowerLauncher.ViewModel
             if (MainWindowVisibility != Visibility.Visible)
             {
                 MainWindowVisibility = Visibility.Visible;
+
+                // HACK: The following code in this if is a fix for https://github.com/microsoft/PowerToys/issues/30206 and https://github.com/microsoft/PowerToys/issues/33135
+                // WPF UI theme watcher removes the composition target background color, among other weird stuff.
+                // https://github.com/lepoco/wpfui/blob/303f0aefcd59a142bc681415dc4360a34a15f33d/src/Wpf.Ui/Controls/Window/WindowBackdrop.cs#L280
+                // So we set it back with https://github.com/lepoco/wpfui/blob/303f0aefcd59a142bc681415dc4360a34a15f33d/src/Wpf.Ui/Controls/Window/WindowBackdrop.cs#L191
+                var window = Application.Current.MainWindow;
+                Wpf.Ui.Controls.WindowBackdrop.RemoveBackground(window);
+
+                // Taken from WPFUI's fix for the title bar issue. We should be able to remove this fix when WPF UI 4 is integrated.
+                // https://github.com/lepoco/wpfui/pull/1122/files#diff-196b404f4db09632665ef546da6c8e57302b2f3e3d082eb4b5c295ae3482d94a
+                IntPtr windowHandle = new WindowInteropHelper(window).Handle;
+                if (windowHandle == IntPtr.Zero)
+                {
+                    return;
+                }
+
+                HwndSource windowSource = HwndSource.FromHwnd(windowHandle);
+
+                // Remove background from client area
+                if (windowSource != null && windowSource.Handle != IntPtr.Zero && windowSource?.CompositionTarget != null)
+                {
+                    // NOTE: https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwmwindowattribute
+                    // Specifying DWMWA_COLOR_DEFAULT (value 0xFFFFFFFF) for the color will reset the window back to using the system's default behavior for the caption color.
+                    uint titlebarPvAttribute = 0xFFFFFFFE;
+                    _ = Wox.Plugin.Common.Win32.NativeMethods.DwmSetWindowAttribute(
+                        windowSource.Handle,
+                        (int)Wox.Plugin.Common.Win32.DwmWindowAttributes.CaptionColor,
+                        ref titlebarPvAttribute,
+                        Marshal.SizeOf(typeof(uint)));
+                }
             }
             else
             {

src/modules/launcher/Wox.Plugin/Common/Win32/NativeMethods.cs

@@ -66,7 +66,7 @@ namespace Wox.Plugin.Common.Win32
         public static extern int DwmpActivateLivePreview([MarshalAs(UnmanagedType.Bool)] bool fActivate, IntPtr hWndExclude, IntPtr hWndInsertBefore, LivePreviewTrigger lpt, IntPtr prcFinalRect);
 
         [DllImport("dwmapi.dll", PreserveSig = false)]
-        public static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);
+        public static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref uint attrValue, int attrSize);
 
         [DllImport("dwmapi.dll", PreserveSig = false)]
         public static extern int DwmGetWindowAttribute(IntPtr hwnd, int dwAttribute, out int pvAttribute, int cbAttribute);
@@ -493,28 +493,28 @@ namespace Wox.Plugin.Common.Win32
     public enum DwmWindowAttributes
     {
         NCRenderingEnabled = 1,
-        NCRenderingPolicy,
+        NCRenderingPolicy = 2,
-        TransitionsForceDisabled,
+        TransitionsForceDisabled = 3,
-        AllowNCPaint,
+        AllowNCPaint = 4,
-        CaptionButtonBounds,
+        CaptionButtonBounds = 5,
-        NonClientRtlLayout,
+        NonClientRtlLayout = 6,
-        ForceIconicRepresentation,
+        ForceIconicRepresentation = 7,
-        Flip3DPolicy,
+        Flip3DPolicy = 8,
-        ExtendedFrameBounds,
+        ExtendedFrameBounds = 9,
-        HasIconicBitmap,
+        HasIconicBitmap = 10,
-        DisallowPeek,
+        DisallowPeek = 11,
-        ExcludedFromPeek,
+        ExcludedFromPeek = 12,
-        Cloak,
+        Cloak = 13,
-        Cloaked,
+        Cloaked = 14,
-        FreezeRepresentation,
+        FreezeRepresentation = 15,
-        PassiveUpdateMode,
+        PassiveUpdateMode = 16,
-        UseHostbackdropbrush,
+        UseHostbackdropbrush = 17,
-        UseImmersiveDarkMode,
+        UseImmersiveDarkMode = 20,
-        WindowCornerPreference,
+        WindowCornerPreference = 33,
-        BorderColor,
+        BorderColor = 34,
-        CaptionColor,
+        CaptionColor = 35,
-        TextColor,
+        TextColor = 36,
-        VisibleFrameBorderThickness,
+        VisibleFrameBorderThickness = 37,
         Last,
     }