Apps with a custom background flash a white background for a couple frames on some devices

dotnet / wpf

WPF is a .NET Core UI framework for building Windows desktop applications.

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Apps with a custom background flash a white background for a couple frames on some devices #5853

Open 1ctinus opened 2 years ago

1ctinus commented 2 years ago

.NET Core Version: (e.g. 3.0 Preview1, or daily build number, use dotnet --info) 6.0.100
Windows version: (winver) Windows 11 10.0.22000
Does the bug reproduce also in WPF for .NET Framework 4.8?:
Is this bug related specifically to tooling in Visual Studio (e.g. XAML Designer, Code editing, etc...)? If yes, please file the issue via the instructions here.
Security issues and bugs should be reported privately, learn more via our responsible disclosure guidelines.

Problem description: Apps with a custom background flash a white background for a couple frames on some devices (previously asked Stack overflow to no avail, pointed to likely a software issue) Actual behavior: Window flashes white before fully loading. Expected behavior: Window opens with the correct background color instantly Minimal repro:
```
dotnet new wpf
```
edit MainWindow.xaml to have a background attribute
```
dotnet build
```
and run the app.

singhashish-wpf commented 2 years ago

@1ctinus Is this issue reproducible on previous windows versions/ previous version of .Net Core/ Framework also?

1ctinus commented 2 years ago

I compiled the program using msbuild 4.8 and running it on the latest version of dotnet, on a separate device running windows 10. the issue persisted.

batzen commented 2 years ago

This also started to happen on my machine like a week ago. It's does not seem to be isolated to WPF as it also happens with Edge. See (increased gif frame delay to 250 ms to make it really visible): window_white_flash

1ctinus commented 2 years ago

I am also having this exact same issue with win32 too.

vishalmsft commented 2 years ago

@1ctinus Can you please use Windows feedback channel to take this up. Hopefully, this issue can be closed.

ZionGates commented 2 years ago

I'm having the same issue, WPF on DOT NET CORE opens the window slower too, about 2 seconds slower. However WPF on dot.net 4.8 sometimes didn't open at all periodically and just hung, at least they fixed that after 15 years...

torum commented 1 year ago

This is a very old known issue of WPF.

In fact, this has been annoyance since 2005! https://social.msdn.microsoft.com/Forums/en-US/3960d6a6-e873-455c-9ddc-1e2dd32e090b/flickering-background-when-resizing-window?forum=wpf

The white background flash happens at start up and window resize (including maximizing). This is so obvious with a Window with fairly complex XAML layout with custom title bar using WindowChrome.

I can't believe this "bug" is still present in 2023.

batzen commented 1 year ago

@torum As i already wrote above, this is not a pure WPF issue. The underlying problem is caused by Windows itself. ControlzEx has code to mitigate the white flash and the resize flickering.

JanHadascok commented 5 months ago

I would like to mention this workaround from SO. Just set Window Opacity to 0 and then in Loaded event set it back to 1. Its dirty workaround but seems to be ok in my case.

mhrastegari commented 1 month ago

Any updates on this?

lindexi commented 1 month ago

@mhrastegari Could you describe your problem? As same as the author's ? And I think it is the Windows's issues not wpf