message: fix sequence label for non-standard residues,
diff: @@ -137,7 +137,7 @@ namespace Sequence {
  });
  labels[i] = `(${l.join('|')})`;
  } else {
  - labels[i] = codes[i] === 'X' ? compIds[idx] : codes[i];
  + labels[i] = codes[i] === 'X' ? compIds[i] : codes[i];
  }
  }
  