MouseEvent.movementX and MouseEvent.movementY are 0 unexpected in Windows App SDK

[kingcean]

Description

In the embedded web page, the MouseEvent.movementX and MouseEvent.movementY are always 0 even if you are moving the mouse. This is not expected.

This WebView2 issue only appears in Windows App SDK app. It works correctly in web browser (Microsoft Edge) and in WPF.

Version

Windows App SDK: 1.0 (built-in WebView2)
Framework: Windows App SDK (packaged)
OS: Windows 10 and Windows 11

Repro Steps

1. Create a web page and add a mousemove event listener into a DOM. Logs the property values of movementX and movementY of the event arguments.
2. Create a Windows App SDK project and target to .NET 6.
3. Add a WebView2 to a page. Navigate the WebView2 to the web page.
4. Run the app (and turn to the page with WebView2).
5. Open DevTools.
6. Move mouse over the DOM for a while, and then check the console of DevTools.

AB#38378087

[champnic]

Thanks for the bug report @kingcean! I've added it to our backlog, and we'll get the WinUI folks to take a first look.

[champnic]

@kingcean This should be fixed in runtimes v101.0.1196.0+. Thanks!