UI stops rendering

[Valkirie]

My application has a window that is never closed but only Hidden/Shown and from time to time it'll stop rendering. I'm able to "fix" the issue by force rendering this specific window with the below, at the cost of slow rendering over CPU.

protected override void OnSourceInitialized(EventArgs e)
{
    WindowInteropHelper helper = new WindowInteropHelper(this);
    HwndSource hwndSource = HwndSource.FromHwnd(helper.EnsureHandle());

    // workaround: fix the stalled UI rendering, at the cost of forcing the window to render over CPU at 30fps
    if (hwndSource != null)
    {
        // hwndSource.CompositionTarget.RenderMode = RenderMode.Default;
        hwndSource.CompositionTarget.RenderMode = RenderMode.SoftwareOnly;
    }

    base.OnSourceInitialized(e);
}

Issue seams to be known across the internet: https://github.com/dotnet-campus/wpf-issues/tree/master/BitmapCache

After digging around, I found the cause in a new Style that was using a BitmapCacheBrush with a BitmapCache.

With issue

Expected

[NotYoojun]

Ok, thanks for reporting. recently im trying to find a way to fix it..

[NotYoojun]

Hi! I tried a lot, but this issue didnt happen on my computer. so sorry and i have no idea how to fix it. I need help 😨😭😢

[Valkirie]

Hi! I tried a lot, but this issue didnt happen on my computer. so sorry and i have no idea how to fix it. I need help 😨😭😢

Interesting. I had the feeling it was vendor specific : AMD. But am not sure. It was mainly triggered by switching apps and going from and into games.

[NotYoojun]

That sucks. Both my CPU and graphics card are made by Intel. So sorry that I can't handle this bug. 😞

[NotYoojun]

I tried a lot, but still unable to solve this. Sorry for that. 😮‍💨😞

[NotYoojun]

Sorry i cant fix this. so im afraid that i have to close this issue. if anyone finds a way to fix this, pls reopen and create a pull request. thanks :(