How to remove the flickering of WinUI3 windows on startup and shutdown

[MrJone2457]

Issue type

sample request

Which version of the app?

WinUI 3 Gallery

Description

The WinUI3 application starts and the interface flickers
When I developed a WinUI3 screenshot application, I found a problem that I hadn't noticed before,
When the WinUI3 application starts and closes, if the system is the light theme, the flashing is white, and the visual effect is obvious. If the system is the black theme, the flashing is black. This problem may be related to this microsoft/microsoft-ui-xaml#5148 issue is somewhat related, but there seems to be no solution to this issue at present.

I personally want the effect to be as clean as the startup effect of the win11 Snipping Tool, or I can set the startup effect of fading in, and it is best to be clean and not flickering when it is closed. Is there any way?
Reference code https://github.com/MrJone2457/ScreenShot

Screenshots

https://twitter.com/i/status/1589994651263852544
Don't know how to upload videos on github, check the video link on Twitter

Windows version

Windows 11 21H2 (22000)

Additional context

No response

[marcelwgn]

Unfortunately, this repository is for the WinUI Gallery and not WinUI itsself. Would you be fine with closing this issue since there are issues on the WinUI repository tracking this bug better?