Only allow distinct licenses on checkout

This patch forces the module to only show a license once. This means if you assign the same license to several products and the customer puts these products into their basket, they will only see the license checkout once.

--- uc_node_panes.module        (revision 18190)
+++ uc_node_panes.module        (working copy)
@@ -84,11 +84,15 @@
  * returns the content to be displayed as a drupal form or false if conditions are not met
  */
 function _uc_node_panes_ucpane($lid) {
+  static $nids = array();
+
   $result = db_query("SELECT * FROM {uc_node_panes} WHERE lid = %d", $lid);
   $row = null;
   $row = db_fetch_array($result);
   while ($row) {
-    if (_uc_node_panes_checkcart($row['pid'])) {
+    if (_uc_node_panes_checkcart($row['pid']) && !isset($nids[$row['nid']])) {
+      $nids[$row['nid']] = TRUE;
+
       $node = node_load($row['nid']);
       unset($node->title);

Essentially its using a static array to only allow a license node to appear once.