Template for local tasks that preserves destination

menu_local_task.tpl.php

<?php
$match = array();


if (preg_match('/<a\shref="([^"]+)"(\s([a-z]+)="([^"]+)")?>([^<]+)<\/a>/', $link, $match)) {
  $parts = parse_url($match[1]);
  $path = trim($parts['path'], '/');
  $opt = array();
  if (!empty($_GET['destination'])) {
    $opt['query']['destination'] = $_GET['destination'];
  }
  if (!empty($match[3])) {
    $opt['attributes'][$match[3]] = $match[4];
  }

  $link = l($match[5], $path, $opt);
}

print '<li '. ($active ? 'class="active" ' : '') .'>'. $link ."</li>\n";