[net9.0][Enhancement] FontImageSource defaults and style

[kubaflo]

Description of Change

    <ContentPage.Resources>
        <Style TargetType="FontImageSource">
            <Setter Property="FontFamily" Value="FA"/>
            <Setter Property="Color" Value="Red"/>
        </Style>
    </ContentPage.Resources>

    <VerticalStackLayout>
        <ImageButton HeightRequest="100" WidthRequest="100" BackgroundColor="Green" Source="{FontImageSource Glyph=''}"/>
        <ImageButton HeightRequest="100" WidthRequest="100" Source="{FontImageSource Color='Black', Glyph=''}"/>
    </VerticalStackLayout>

Issues Fixed

Fixes #13474

[dotnet-policy-service]

Hey there @kubaflo! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[rmarinho]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[rmarinho]

/rebase

[rmarinho]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[rmarinho]

@kubaflo can we add a test for this? We can add a xaml unit test and maybe a a screenshot uitest test to make it looks ok at runtime.

[kubaflo]

@rmarinho Sure, I can add tests on the weekend. The reason I haven't added them is that was that I wasn't sure if you wanted this feature in MAUI :)

[kubaflo]

@rmarinho I've added a XAML and a UITest

[StephaneDelcroix]

MergedStyle is set at VisualElement currently. it should probably be set for everything that can get a Style. This is a workaround, and if we go that route, we probably will have to apply it at multiple places

[PureWeen]

@StephaneDelcroix does this PR make sense to merge?

I can't quite extract from your last comment if you're thinking this is a good way to go.
Sounds like you're thinking we need a little bit more discussion here?

[PureWeen]

/rebase

[PureWeen]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[PureWeen]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[PureWeen]

Chatted with @StephaneDelcroix and he gave this one the thumbs up