[Bug] RefreshView with CollectionView child cannot contain GridItemsLayout with Span greater than 1 in combination with EmptyView on UWP

[tomreich]

Description

Creating a RefreshView that has a CollectionView that has both CollectionView.ItemsLayout set vertical with a span of greater than one AND CollectionView.EmptyView causes a crash in the UWP environment. No crash in Android. Haven't tried in iOS.

Steps to Reproduce

The following XAML produces the error when the CollectionView is wired up to an Observable Collection. Comment out either CollectionView.ItemsLayout or CollectionView.EmptyView and the issue goes away.

<RefreshView> <CollectionView x:Name="testCollectionView"> <CollectionView.ItemsLayout> <GridItemsLayout Orientation="Vertical" Span="3" /> </CollectionView.ItemsLayout> <CollectionView.ItemTemplate> <DataTemplate> <Frame> <Label Text="{Binding .}" /> </Frame> </DataTemplate> </CollectionView.ItemTemplate> <CollectionView.EmptyView> <StackLayout IsVisible="{Binding IsEmpty}"> <Label Text="Welcome to crashtown" /> </StackLayout> </CollectionView.EmptyView> </CollectionView> </RefreshView>

Expected Behavior

CollectionView Renders successfully

Actual Behavior

Application crash

Basic Information

• Version with issue: Xamarin.Forms 4.8.0.1269
• Last known good version:
• IDE: Visual Studio 2019
• Platform Target Frameworks:
  • iOS: N/A
  • Android: API 28
  • UWP: 18362
• Android Support Library Version: N/A
• Nuget Packages: Xamarin.Forms 4.8.0.1269
• Affected Devices:

Screenshots

N/A

Reproduction Link

N/A

Workaround

N/A