message: [vtbackend] Improve trace mode's terminal output.
diff: @@ -2140,7 +2140,10 @@ void TraceHandler::flushOne(PendingSequence const& pendingSequence)
  {
  if (auto const* seq = std::get_if<Sequence>(&pendingSequence))
  {
  - fmt::print("\t{}\n", seq->text());
  + if (auto const* functionDefinition = seq->functionDefinition())
  + fmt::print("\t{:<20} ; {:<18} ; {}\n", seq->text(), functionDefinition->mnemonic, functionDefinition->comment);
  + else
  + fmt::print("\t{:<20}\n", seq->text());
  _terminal.activeDisplay().processSequence(*seq);
  }
  else if (auto const* codepoint = std::get_if<char32_t>(&pendingSequence))
  