Description

When using item reordering in CollectionView (#3768) with a defined Header, I encounter an ArgumentOutOfRangeException when attempting to move an item to the last position of the list. This issue is not present when the Header is omitted.

System.ArgumentOutOfRangeException: 'Index was out of range. Must be non-negative and less than or equal to the size of the collection. (Parameter 'index')'

Steps to Reproduce

1. Create default MAUI project
2. Define a CollectionView with a Header and ItemTemplate to xaml file:

<CollectionView
    x:Name="TestCollectionView"
    CanReorderItems="True"
    CanMixGroups="True">

    <CollectionView.Header>
        <Label Text="Header"/>
    </CollectionView.Header>
    
    <CollectionView.ItemTemplate>
        <DataTemplate>
            <Label Text="{Binding .}"/>
        </DataTemplate>
    </CollectionView.ItemTemplate>
</CollectionView>

3. Populate ItemSource in xaml.cs file:

public TestCollectionViewPage()
{
    InitializeComponent();
    TestCollectionView.ItemsSource = new List<string>()
    {
        "Test label 1",
        "Test label 2",
        "Test label 3",
        "Test label 4",
        "Test label 5",
        "Test label 6",
    };
}

4. Drag random Item from the middle to last position in the list

Link to public reproduction project repository

No response

Version with bug

7.0.96

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

No response