Dispose pChildVisual when CEOL being disposed

Author: 0x5bfa

src/Files.App/ViewModels/UserControls/Previews/ShellPreviewViewModel.cs

@@ -37,6 +37,7 @@ public sealed partial class ShellPreviewViewModel : BasePreviewModel
 		WindowClass? wCls;
 		HWND hwnd = HWND.NULL;
 		bool isOfficePreview = false;
+		ComPtr<IDCompositionVisual> pChildVisual = default;
 
 		[GeneratedComInterface, Guid("EACDD04C-117E-4E17-88F4-D1B12B0E3D89"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
 		public partial interface IDCompositionTarget
@@ -168,7 +169,6 @@ private unsafe bool ChildWindowToXaml(nint parent, UIElement presenter)
 			using ComPtr<IDXGIDevice> pDXGIDevice = default;
 			using ComPtr<IDCompositionDevice> pDCompositionDevice = default;
 			using ComPtr<IUnknown> pControlSurface = default;
-			ComPtr<IDCompositionVisual> pChildVisual = default; // Don't dispose this one, it's used by the compositor
 
 			// Create the D3D11 device
 			foreach (var driverType in driverTypes)
@@ -236,6 +236,8 @@ public void UnloadPreview()
 			outputLink?.Dispose();
 			outputLink = null;
 
+			pChildVisual.Dispose();
+
 			if (wCls is not null)
 				UnregisterClass(wCls.ClassName, Kernel32.GetModuleHandle());
 		}