RichSuggestBox SuggestionChosenEventArgs.Format.ForegroundColor only works if BackgroundColor is set to non-Transparent

[kmgallahan]

Describe the bug

In a SuggestionChosen handler, using SuggestionChosenEventArgs.Format.ForegroundColor to set token text color only works if a SuggestionChosenEventArgs.Format.BackgroundColor is set to something other than Colors.Transparent.

If this isn't done then the foreground color used it the default dark blue for links.

Steps to reproduce

Use a handler such as this and observe the text is not white:


private void SuggestingBox_SuggestionChosen(RichSuggestBox sender, SuggestionChosenEventArgs args)
    {
        if (args.Prefix == "#")
        {
            args.Format.ForegroundColor = Colors.White;
            args.Format.Bold = FormatEffect.On;
            args.DisplayText = ((SampleDataType)args.SelectedItem!).Text;
        }
        else
        {
            args.DisplayText = ((SampleEmailDataType)args.SelectedItem!).DisplayName;
        }
    }

Expected behavior

A background color choice should not be required, although I'm unsure if this is a limitation of the RichEditBox control.

Screenshots

No response

Code Platform

• [ ] UWP
• [X] WinAppSDK / WinUI 3
• [ ] Web Assembly (WASM)
• [ ] Android
• [ ] iOS
• [ ] MacOS
• [ ] Linux / GTK

Windows Build Number

• [ ] Windows 10 1809 (Build 17763)
• [ ] Windows 10 1903 (Build 18362)
• [ ] Windows 10 1909 (Build 18363)
• [ ] Windows 10 2004 (Build 19041)
• [ ] Windows 10 20H2 (Build 19042)
• [ ] Windows 10 21H1 (Build 19043)
• [ ] Windows 10 21H2 (Build 19044)
• [X] Windows 10 22H2 (Build 19045)
• [ ] Windows 11 21H2 (Build 22000)
• [ ] Other (specify)

Other Windows Build number

No response

App minimum and target SDK version

• [ ] Windows 10, version 1809 (Build 17763)
• [ ] Windows 10, version 1903 (Build 18362)
• [ ] Windows 10, version 1909 (Build 18363)
• [X] Windows 10, version 2004 (Build 19041)
• [ ] Windows 10, version 2104 (Build 20348)
• [ ] Windows 11, version 22H2 (Build 22000)
• [ ] Other (specify)

Other SDK version

WASDK 1.5.240205001-preview1

Visual Studio Version

Preview

Visual Studio Build Number

Version 17.10.0 Preview 1.0

Device form factor

Desktop

Additional context

No response

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