ItemsRepeater with NonVirtualizingLayout doesn't react to Replace action on ItemsSource

[acouvert-msft]

Describe the bug

When replacing an entry in an ObservableCollection, used as ItemsSource of an ItemsRepeater configured with an NonVirtualizingLayout layout, the control receives a collection changed event about the Replace action but the NonVirtualizingLayoutContext provided to the MeasureOverride and ArrangeOverride will still have old Children representing old value.

Steps to reproduce the bug

1. Create an ItemsRepeater with an ObservableCollection as ItemsSource and a NonVirtualizingLayout as Layout
2. Update the ObservableCollection by replacing one entry with a new value
3. Observe that the UI is not updated and still displays the old value of the entry which has been replaced.

Expected behavior

The UI should refresh and displays the new value instead of the old one.

Screenshots

No response

NuGet package version

No response

Windows app type

• UWP
• Win32

Device form factor

Desktop

Windows version

Insider Build (xxxxx)

Additional context

Note that ItemsRepeater::OnItemsSourceViewChanged is well received as expected when the replace action occurs.

[StephenLPeters]

@ranjeshj FYI

[danmartinez]

I encounter this issue with all Layout types, and during insertion and removal as well (not just when replacing an entry). However, I only experience this issue when the DataTemplate is a custom type. Defining the Xaml inline rather than in a separate UserControl works as intended.

[github-actions]

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