[Bug] CollectionView Header vs EmptyView conflict

[stesvis]

Description

In the CollectionView, the Header is disappearing when I use a custom EmptyView and there are no results (from the second refresh).
If I use the inline EmptyView, everything works.

The layout is the grid layout:

<CollectionView.ItemsLayout>
    <GridItemsLayout Orientation="Vertical"
                        Span="2"
                        VerticalItemSpacing="8"
                        HorizontalItemSpacing="8" />
</CollectionView.ItemsLayout>

Steps to Reproduce

1. Add a collection view with Header and EmptyView and a searchbar
2. As you type, filter the results. Type until the EmptyView shows.
3. Keep typing and the Header disappears

Expected Behavior

Header remains visible

Actual Behavior

Header disappears

Basic Information

• Version with issue: 5.0.0.1874
• Last known good version: N/A
• Platform Target Frameworks:
  • iOS:
  • Android: 10.0
  • UWP:
• Android Support Library / AndroidX Version:
• NuGet Packages: ReactiveUI
• Affected Devices:

Environment

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Microsoft Visual Studio Community 2019
Version 16.8.3
VisualStudio.16.Release/16.8.3+30804.86
Microsoft .NET Framework
Version 4.8.03752

Installed Version: Community

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ASP.NET Web Frameworks and Tools 2019   16.8.554.20160
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Xamarin.iOS and Xamarin.Mac SDK   14.6.0.15 (87a1b18d8)
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Build Logs

Screenshots

Example 1 (inline EmptyView):
EmptyView="No listings were found. Try with a bigger range..."
collectionView.zip

Example 2 (custom EmptyView):

<CollectionView.EmptyView>
    <StackLayout Padding="{StaticResource pagePadding}">
        <Label Text="No listings were found. Try with a bigger range..."
                Style="{StaticResource label-emptyView}" />
    </StackLayout>
</CollectionView.EmptyView>

collectionView-bug.zip

Reproduction Link

Workaround

[rmarinho]

Hi @stesvis i had some issues trying to reproduce this issue, is it possible to upload a small sample that shows the problem instead of the video.

Thanks

[alla-dragon]

Hey @rmarinho !
I also faced with this issue, please find an attached the project with bug and video of reproducing:

issue_13371.zip
https://user-images.githubusercontent.com/5936989/107803764-b923ee00-6d6b-11eb-8198-7f46bd7674c5.mov

Versions with issue: 4.7.0.1080, 5.0.0.1931
Android Target Frameworks: 9.0, 10.0