Moving WebView2 to another window still routes window message to previous window

[HO-COOH]

Describe the bug

There is a scenario where I need to stack two WebView2 controls on top of each other, and then when user clicks a button, one WebView2 pops up as a new window. Originally I asked the question here
I tried removing the WebView2 from a Grid in the old window and make it as a child to the Grid in the new window, and it seems to be working, except that when interacting with the new window, the old window gets activated and bought to the front of the new window.

My method might be wrong, but doing the same thing with other controls such as a ToggleButton gives expected behavior, and does not activate the previous window.

Steps to reproduce the bug

1. In MainWindow.xaml

<Window
    ...
    <Grid x:Name="RootGrid">
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <WebView2 x:Name="Browser" Source="https://www.google.com"/>
        <Button Click="Button_Click" Grid.Row="1">Move</Button>
    </Grid>

2. Create another window, call it BlankWindow

<Window
    ...
    <Grid x:Name="RootGrid" Background="Red"/>

3. In the button handler code,

void winrt::WinUI3Cpp2::implementation::MainWindow::Button_Click(winrt::Windows::Foundation::IInspectable const& sender, winrt::Microsoft::UI::Xaml::RoutedEventArgs const& e)
{
    winrt::WinUI3Cpp2::BlankWindow window;
    
    window.Activated([this, window](auto...)
        {
            static bool called = false;
            if (called)
                return;

            window.RootGrid().Loaded(
                [this, window](auto...)
                {
                    auto webview = Browser();
                    RootGrid().Children().RemoveAt(0);
                    window.RootGrid().Children().Append(webview);
                }
            );
            called = true;
        });
    window.Activate();
}

Expected behavior

The previous window should not get activated.

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.5 Experimental 1: 1.5.231202003-experimental1

Windows version

Windows 11 (22H2): Build 22621

Additional context

No response

[github-actions]

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Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one. Thank you!

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[HO-COOH]

Duplicate of #7335