Custom layout in a ContentView appears to 'force' a 1 pixel padding around the content.

[DanTravison]

I have a ContentView with a custom layout (FlyoutLayout) containing custom control (Thumb) on one of the edges and a ContentPresenter to fill the remaining space.

The problem I see is there's a 1 pixel padding around the arranged content.

For example, if I change the BackgroundColor to Green and layout explicitly arranges a control at 0,0, I still see Green between the top/left of the control and the top/left edge of the FlyoutLayout.

I've tested this on Windows and MacCatalyst and both exhibit the behavior, and I can find no combination of LayoutOptions that solves the problem.

<ContentView.ControlTemplate>
    <ControlTemplate>
        <local:FlyoutLayout x:Name="FlyoutLayout"
                        BackgroundColor="{TemplateBinding BackgroundColor}"
                        Margin="0"
                        Padding="0">
            <local:Thumb x:Name="Thumb" Style="{StaticResource ThumbStyle}"/>
            <ContentPresenter x:Name="Presenter"
                            HorizontalOptions="Fill"
                            VerticalOptions="Fill"/>
        </local:FlyoutLayout>
    </ControlTemplate>
</ContentView.ControlTemplate>