[Bug] Grid broken in 4.8.0.1687

[jthun]

Description

There seems to be an issue with Grid layout in XF 4.8.0.1687.

Steps to Reproduce

1. Create new blank Xamarin Forms project.
2. Paste the sample MainPage.xaml
3. Run and observe the difference between for example 4.8.0.1560 and .1687. The grid is much smaller in .1687 and this is destroying the entire app look-and-feel.

MainPage.xaml

<ContentPage.Resources>
    <Color x:Key="GridBackgroundColor">#AFAFAF</Color>
</ContentPage.Resources>

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>

    <Frame
        Grid.Row="0"
        Padding="24"
        BackgroundColor="#2196F3"
        CornerRadius="0">
        <Label
            FontSize="36"
            HorizontalTextAlignment="Center"
            Text="Grid Test, XF 4.8.0.1687"
            TextColor="White" />
    </Frame>

    <Grid
        Grid.Row="1"
        HorizontalOptions="Center"
        VerticalOptions="Center">

        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="3*" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="3*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <BoxView
            Grid.Row="0"
            Grid.Column="0"
            BackgroundColor="{StaticResource GridBackgroundColor}" />

        <BoxView
            Grid.Row="0"
            Grid.Column="2"
            BackgroundColor="{StaticResource GridBackgroundColor}" />

        <BoxView
            Grid.Row="2"
            Grid.Column="0"
            BackgroundColor="{StaticResource GridBackgroundColor}" />

        <BoxView
            Grid.Row="2"
            Grid.Column="2"
            BackgroundColor="{StaticResource GridBackgroundColor}" />

    </Grid>
</Grid>

Expected Behavior

Actual Behavior

Basic Information

• Version with issue: 4.8.0.1687
• Last known good version: 4.8.0.1560
• Platform Target Frameworks:
  • iOS: Not tested
  • Android: 9.0
  • UWP: Not tested
• Android Support Library / AndroidX Version:
• NuGet Packages:
• Affected Devices:

Environment

Build Logs

Screenshots

Reproduction Link

Workaround

[jthun]

Might be a duplicate of #12900