public static HighlightColor Transform(this HighlightColor original)
{
var backReplacement = Adapt(original.BackgroundColor, isForeground: false);
var replacement = Adapt(original.Color, isForeground: true);
return(new HighlightColor(original, replacement, backReplacement));
Color Adapt(Color c, bool isForeground) =>
c.IsSystemColor
? c
: ColorHelper.AdaptColor(c, isForeground);
}