[Problem/Bug]: win32C++ Webview2 When loading webpage content, the screen will flash white

[qiqi233]

What happened?

Flash White：

After 1~2s, loading is normal：

Importance

Moderate. My app's user experience is affected, but still usable.

Runtime Channel

Prerelease (Edge Canary/Dev/Beta)

Runtime Version

129.0.2792.79

SDK Version

1.0.2730-prerelease

Framework

Win32

Operating System

Windows 11

OS Version

No response

Repro steps

When the callback enters "OnCreateCoreWebView2ControllerCompleted", the code will flash white when it executes to line 338

Repros in Edge Browser

Yes, issue can be reproduced in the corresponding Edge version

Regression

Don't know

Last working version (if regression)

No response

[qiqi233]

Hello, is there a way to solve or avoid this problem?

[bradp0721]

@qiqi233 When you get to this spot, can you Spy++ (available in Visual Studio's Tools dropdown menu) to get information about the HWND for the white window you're seeing? Ideally, provide the HWND class name, and process that owns the HWND.

[qiqi233]

Thank you, but during today's testing, I found that the flashing white no longer exists. Thank you very much. Additionally, the Spy++tool is very useful