Why do I still get a flash?

[ajtruckle]

Please wait a few seconds as i start my app. Then you will see the flash:

20251006-1128-13.2176151.mp4

The app is running in dark mode and the browser is set as such:

m_pWebBrowser->SetPreferredColorScheme(IsUsingDarkMode()
	? COREWEBVIEW2_PREFERRED_COLOR_SCHEME_DARK
	: COREWEBVIEW2_PREFERRED_COLOR_SCHEME_LIGHT
);

Delving into my CWebBrowser wrapper I have:

BOOL CWebBrowser::CreateHostWindow(
	LPCTSTR lpszClassName,
	LPCTSTR lpszWindowName,
	DWORD dwStyle,
	const RECT& rect,
	CWnd* pParentWnd,
	UINT nID)
{
	if (lpszClassName == nullptr)
		lpszClassName = GetWindowClass();

	if (!CWnd::Create(lpszClassName, lpszWindowName, dwStyle, rect, pParentWnd, nID))
		return FALSE;

	::SetWindowLongPtr(m_hWnd, GWLP_USERDATA, (LONG_PTR)this);

	m_pParentWnd = pParentWnd;

	return TRUE;
}

That function calls GetWindowClass, which is defied like this:

PCTSTR CWebBrowser::GetWindowClass()
{
	static PCTSTR windowClass = []
	{
		static TCHAR const* className = L"EdgeBrowserHost";

		WNDCLASSEX wcex;
		wcex.cbSize = sizeof(WNDCLASSEX);

		wcex.style = CS_HREDRAW | CS_VREDRAW;
		wcex.lpfnWndProc = WndProcStatic;
		wcex.cbClsExtra = 0;
		wcex.cbWndExtra = 0;
		wcex.hInstance = AfxGetInstanceHandle();
		wcex.hIcon = nullptr;
		wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);

		if (DarkModeTools::InvokeUseDarkModeFunction())
		{
			static auto hbr = CreateSolidBrush(DarkModeTools::kDarkBackgroundColor);
			wcex.hbrBackground = hbr;
		}
		else
			wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);

		wcex.lpszMenuName = nullptr;
		wcex.lpszClassName = className;
		wcex.hIconSm = nullptr;

		ATOM result = RegisterClassEx(&wcex);
		if (result == 0)
		{
			[[maybe_unused]] DWORD lastError = ::GetLastError();
		}

		return className;
	}();

	return windowClass;
}

As you can see, I take steps to set the ``hbrBackground` correctly.

But I still get that initial flash when app starts.

Using latest stable WebnView2 and Windows 11, Win32:

Runtime: 140.0.3485.94
SDK: 3485.44
OS Build: 10.0.26100 (24H2)

I should point out that I am displaying a XML file, which is transformed using a XSLT1 script.

[ajtruckle]

Any response please? Thank you.