Ungroup objects back to their own layers - Illustrator

My solution requires repeated runs of the script, but it works. First save parent layers via object attribute, and restore on request.

/*
  RememberLayers.jsx for Adobe Illustrator
  Description:
  Saving and restoring selected items to their original layers.
  The order within the layers is not restored
  Author: Sergey Osokin, email: hi@sergosokin.ru
*/

//@target illustrator
app.preferences.setBooleanPreference('ShowExternalJSXWarning', false); // Fix drag and drop a .jsx file

function main() {
  if (!documents.length) return;
  if (selection.length == 0 || selection.typename == 'TextRange') return;

  var doc = activeDocument,
      docSel = selection,
      keyPref = 'origLayer=';

  // DIALOG
  var dialog = new Window('dialog', 'Remember Layers');
      dialog.preferredSize.width = 146;
      dialog.orientation = 'column';
      dialog.alignChildren = ['fill', 'center'];

  var saveBtn = dialog.add('button', undefined, 'Save');
  var restoreBtn = dialog.add('button', undefined, 'Restore');
  var cancel = dialog.add('button', undefined, 'Cancel', {name: 'cancel'});

  var copyright = dialog.add('statictext', undefined, '\u00A9 Sergey Osokin');
      copyright.justify = 'center';
      copyright.enabled = false;

  saveBtn.onClick = save;
  restoreBtn.onClick = restore;
  cancel.onClick = dialog.close;

  function save() {
    for (var i = 0, len = selection.length; i < len; i++) {
      var currItem = selection[i];
      removeNote(currItem, keyPref);
      currItem.note += keyPref + currItem.layer.name + ';';
    }
    dialog.close();
  }

  function restore() {
    var regexp = new RegExp(keyPref + '(.+)', 'g')
    for (var i = selection.length - 1; i >= 0; i--) {
      var currItem = selection[i],
          layerName = '';
      if (currItem.note.match(keyPref) !== null) {
        layerName = currItem.note.split(';')[0].replace(regexp, '$1');
        moveToLayer(currItem, layerName);
      }
      removeNote(currItem, keyPref);
    }
    dialog.close();
  }

  dialog.center();
  dialog.show();
}

// Remove keyword from Note in Attributes panel
function removeNote(item, key) {
  var regexp = new RegExp(key + '(.+);', 'g');
  item.note = item.note.replace(regexp, '');
}

// Move selected item to original Layer by name
function moveToLayer(item, name) {
  var origLayer;
  try {
    origLayer = activeDocument.layers.getByName(name);
    item.move(origLayer, ElementPlacement.PLACEATBEGINNING);
  } catch (e) {}
}

try {
  main()
} catch (e) {}