Issue #2426731 by joelpittet: Dragging fields in Manage Display doesn't work anymore

  // across a site visit without being cut by a page using a less common file.

  $nested = array();

  foreach ($items as $key => $item) {

    $nested[$item['group']][$item['every_page'] ? 1 : 0][$item['weight']][$key] = $item;

    // Weight cast to string to preserve float.

    $weight = (string) $item['weight'];

    $nested[$item['group']][$item['every_page'] ? 1 : 0][$weight][$key] = $item;

  }

  // First order by group, so that, for example, all items in the CSS_SYSTEM

  // group appear before items in the CSS_DEFAULT group, which appear before