Fluent2 Window Style Missing Setters

[robert-abeo]

Description

The Fluent2 Window Style is missing a few very important setters. I suspect some of them might be on purpose but it still should be discussed:

• Background
• FontFamily, FontSize

Reproduction Steps

See current default control style:

https://github.com/dotnet/wpf/blob/main/src/Microsoft.DotNet.Wpf/src/Themes/PresentationFramework.Fluent/Styles/Window.xaml

Expected behavior

The following should be set to ensure the application follows upstream Fluent2 theme.

The window Background should be using the pre-existing WindowBackground resource instead of Transaparent.

I realize font-related properties may intentionally NOT be set so the UI is more similar to Aero2 and older themes for compatibility with existing apps. However, I would still argue the font family/size is important to the Fluent look-and-feel and we should set these by default. Apps can disable them if desired.

        <Setter Property="Background" Value="{DynamicResource WindowBackground}" />
        <Setter Property="FontFamily" Value="{DynamicResource ContentControlThemeFontFamily}" />
        <Setter Property="FontSize" Value="{DynamicResource ControlContentThemeFontSize}" />

Actual behavior

Properties are not set

Regression?

No response

Known Workarounds

No response

Impact

No response

Configuration

No response

Other information

No response