In High Contrast them, the selected item in a tab control is not underlined

[dowdybrown]

In the High Contrast theme, the selected tab item is shown with a white underline (pipe) on a white background, so there is no visible indication of which tab is selected.

• OS: Windows 11
• FluentAvalonia Version: 2.0.5
• Avalonia Version 11.0.9 & 11.0.10

I tried fixing it using a theme dictionary within my test app, but couldn't make it work.

<ResourceDictionary x:Key="{x:Static sty:FluentAvaloniaTheme.HighContrastTheme}">
            <SolidColorBrush x:Key="TabItemHeaderSelectedPipeFill" Color="DodgerBlue" />
</ResourceDictionary>

Obviously, you wouldn't place a fixed color here, but probably link it to the system accent color -- but I was just testing.