MediaWiki:Common.js

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$(document).ready(function () {
  $('select[name="Tune[Composer][is_list]"], select[name="Tune[Lyricist][is_list]"]').on('select2:select', function (e) {
    var selected = e.params.data.text;
    var match = selected.match(/\((TITAF-[^)]+)\)$/); // extracts TITAF-P-xxxxxxx
    if (match) {
      var newVal = match[1]; // TITAF-P-xxxxxxx
      var newOption = new Option(newVal, newVal, true, true);
      $(this).append(newOption).trigger('change');
      var oldOption = $(this).find('option').filter(function () {
        return $(this).text() === selected;
      });
      oldOption.remove();
    }
  });
});