[Problem/Bug]: Prevent opening a window via CoreWebView2 NewWindowRequest doesn’t work

[neo42deg]

What happened?

If i subscribe the CoreWebView2 NewWindowRequest event and set e.Handled to true, it opens in a new window instead of doing nothing.

Importance

Blocking. My app's basic functions are not working due to this issue.

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

122.0.2365.92

SDK Version

1.0.2151.40

Framework

WPF

Operating System

Windows 11

OS Version

22621.3296

Repro steps

• Add Microsoft.AspNetCore.Components.WebView.Wpf NuGet to a WPF project

• Add BlazorWebView in the MainWindow and subscribe the BlazorWebViewInitializing event

        <blazor:BlazorWebView x:Name="blazorWebView" HostPage="wwwroot\Index.html" Services="{DynamicResource services}" BlazorWebViewInitializing="OnInitWebView">
            <blazor:BlazorWebView.RootComponents>
                <blazor:RootComponent Selector="#app" ComponentType="{x:Type local:Main}" />
            </blazor:BlazorWebView.RootComponents>
        </blazor:BlazorWebView>

• Subscribe CoreWebView2InitializationCompleted in the OnInitWebView event handler

       private void OnInitWebView(object sender, BlazorWebViewInitializingEventArgs e)
       {
           blazorWebView.WebView.CoreWebView2InitializationCompleted += CoreWebView2InitializationCompleted;
       }

• Subscribe NewWindowRequested in the CoreWebView2InitializationCompleted event handler and set e.Handled to true

        private void CoreWebView2InitializationCompleted(object? sender, CoreWebView2InitializationCompletedEventArgs e)
        {
            blazorWebView.WebView.CoreWebView2.NewWindowRequested += (sender, e) =>
            {
                e.Handled = true;
            };
        }

• Start the application and drag and drop a text file on the WebView2

It opens the text file in editor instead of doing nothing.

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

Don't know

Last working version (if regression)

No response

[JosephJin0815]

I could not repro this issue in 122.0.2365.92 on my end. @neo42deg would you mind to upload your sample app?

[neo42deg]

@JosephJin0815 I can repro the issue with the attached sample app in runtime version 122.0.2365.92 and 124.0.2478.80.

Wpf_Blazor_Test.zip