[Windows] Change the LineStackingStrategy to BlockLineHeight for Labels on Windows

[PureWeen]

Description

The default LineStackingStrategy on WinUI currently means that using a LineHeight multiplier < 1 will have no effect.

Given the following XAML.

  <VerticalStackLayout>

    <Label BackgroundColor="Green" FontSize="20" Text="ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ"/>
    <Label Grid.Row="1" AutomationId="label" BackgroundColor="Red" LineHeight="0.8" FontSize="20" Text="ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ"/>
    <Label Grid.Row="1" AutomationId="label" BackgroundColor="Green" LineHeight="0.2" FontSize="20" Text="ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ"/>
    <Label Grid.Row="1" AutomationId="label" BackgroundColor="Red" LineHeight="0.4" FontSize="20" Text="ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ"/>
    <Label Grid.Row="1" AutomationId="label" BackgroundColor="Green" LineHeight="1.0" FontSize="20" Text="ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ"/>
    <Label Grid.Row="1" AutomationId="label" BackgroundColor="Red" LineHeight="1.2" FontSize="20" Text="ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ"/>
    <Label Grid.Row="1" AutomationId="label" BackgroundColor="Green" LineHeight="1.4" FontSize="20" Text="ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ"/>
    <Label Grid.Row="1" AutomationId="label" BackgroundColor="Red" LineHeight="1.6" FontSize="20" Text="ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ"/>
    <Label Grid.Row="1" AutomationId="label" BackgroundColor="Green" LineHeight="2.0" FontSize="20" Text="ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ"/>
    <Label Grid.Row="1" AutomationId="label" BackgroundColor="Red" LineHeight="4.6" FontSize="20" Text="ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ"/>
  </VerticalStackLayout>

WinUI currently looks like this

If you change the LineStackingStrategy to BlockLineHeight it looks like this

The second image seems like it should be our default across platforms

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• [WinUI] LineHeight behavior is different from HTML&CSS behavior (#21705), similarity score: 0.70

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