Describe the bug

Teaching tip is displayed out of screen when ShouldConstrainToRootBounds is False

Steps to reproduce the bug

1. Use the following XAML code

<Grid>
    <ToggleButton
        x:Name="button"
        HorizontalAlignment="Right"
        Content="Click me" />
    <controls:TeachingTip
        x:Name="teachingTip"
        Title="I'm a teaching tip"
        IsOpen="{x:Bind button.IsChecked.Value, Mode=OneWay}"
        PreferredPlacement="Bottom"
        ShouldConstrainToRootBounds="False"
        Subtitle="The teaching tip subtitle"
        Target="{x:Bind button}" />
</Grid>

2. Run the application
3. Maximize the window
4. Click on the button
5. The TeachingTip appears and is partially displayed out of the screen.

Expected behavior

The teaching tip should be fully visible on screen.
If the placement constraint cannot be fulfill , the code should adjust it to ensure that the content will be visible. For example, a Bottom placement can be adjusted to BottomRight.

Screenshots

NuGet package version

WinUI 2 - Microsoft.UI.Xaml 2.8.2

Windows version

No response

Additional context

No response