message: [terminal] Capabilities: Adds 'Su' tcap (for curly underline)
diff: @@ -35,6 +35,7 @@ using String = Cap<std::string_view>;
  namespace {
  constexpr inline auto booleanCaps = std::array{
  + Boolean{ "Su"_tcap, "Su"sv, true }, // supports extended underline styling (such as undercurl)
  Boolean{ "am"_tcap, "sm"sv, true }, // terminal has automatic margins
  Boolean{ "ut"_tcap, "bce"sv, true }, // screen erased with background color
  Boolean{ "cc"_tcap, "ccc"sv, true }, // terminal can re-define existing colors
  