StaggeredLayout crashes on ARM64 build

[euju-ms]

Describe the bug

The StaggeredLayout from the new namespace CommunityToolkit.WinUI.Controls.Primitives crashes on ARM64 build when used in an ItemsView with the following StackTace:

Message = "Array dimensions exceeded supported range."

   at CommunityToolkit.WinUI.Controls.StaggeredLayout.MeasureOverride(VirtualizingLayoutContext context, Size availableSize)
   at Microsoft.UI.Xaml.Controls.VirtualizingLayout.Microsoft.UI.Xaml.Controls.IVirtualizingLayoutOverrides.MeasureOverride(VirtualizingLayoutContext context, Size availableSize)
   at ABI.Microsoft.UI.Xaml.Controls.IVirtualizingLayoutOverrides.Do_Abi_MeasureOverride_2(IntPtr thisPtr, IntPtr context, Size availableSize, Size* result)

Note that the sample app also crashes if you go to the StaggeredLayout page (IF you are on ARM64 device).

Regression

No response

Reproducible in sample app?

• [x] This bug can be reproduced in the sample app.

Steps to reproduce

1. Build and run the sample app on ARM64.
2. Observe the crash.

Here's the link for the sample app: https://github.com/euju-ms/StaggeredLayoutArm64

The code basically uses the StaggeredLayout in ItemsView.

<ItemsView ...>

    <ItemsView.Layout>
        <tkControls:StaggeredLayout />
    </ItemsView.Layout>
</ItemsView>

Expected behavior

Expected to see three items show up instead of crashing.

Screenshots

Following three blue squares should show when it works; but using the newest StaggeredLayout crashes the app immediately.

Windows Build Number

• [ ] Windows 10 1809 (Build 17763)
• [ ] Windows 10 1903 (Build 18362)
• [ ] Windows 10 1909 (Build 18363)
• [ ] Windows 10 2004 (Build 19041)
• [ ] Windows 10 20H2 (Build 19042)
• [ ] Windows 10 21H1 (Build 19043)
• [ ] Windows 11 21H2 (Build 22000)
• [X] Other (specify)

Other Windows Build number

Windows 11 24H2 (Build 26100.1742)

App minimum and target SDK version

• [X] Windows 10, version 1809 (Build 17763)
• [ ] Windows 10, version 1903 (Build 18362)
• [ ] Windows 10, version 1909 (Build 18363)
• [ ] Windows 10, version 2004 (Build 19041)
• [ ] Other (specify)

Other SDK version

No response

Visual Studio Version

2022

Visual Studio Build Number

Version 17.11.3

Device form factor

Desktop

Nuget packages

<PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.756" />
<PackageReference Include="Microsoft.WindowsAppSDK" Version="1.6.240829007" />
<PackageReference Include="CommunityToolkit.WinUI.Controls.Primitives" Version="8.1.240916" />

Additional context

I set WindowsSdkPackageVersion of 10.0.22621.45 for WinAppSdk 1.6 to work (but I verified that the issue persists without this in WinAppSdk 1.5.240802000).

I have also verified that the StaggeredLayout from the old package CommunityToolkit.WinUI.UI.Controls version 7.1.2 works.

Help us help you

No.