Fix regression introduced with fix for Bug: 13837.

The share list used when building the task form must match
the share list used when determining the tasklist to save
a task to. Otherwise, the form may see only 1 tasklist available
(thus not including the tasklist_id), but the save controller may
see more than 1 (thus expecting the tasklist_id).

nag/app/controllers/SaveTask.php

@@ -51,7 +51,7 @@ public function processRequest(Horde_Controller_Request $request, Horde_Controll
         }
 
         if ($prefs->isLocked('default_tasklist') ||
-            count(Nag::listTasklists(false, Horde_Perms::EDIT, false)) <= 1) {
+            count($this->_getTasklists()) <= 1) {
             $info['tasklist_id'] = $info['old_tasklist'] = Nag::getDefaultTasklist(Horde_Perms::EDIT);
         }
         try {
@@ -119,4 +119,24 @@ public function processRequest(Horde_Controller_Request $request, Horde_Controll
         $response->setRedirectUrl($url);
     }
 
+    /**
+     * Return tasklists the current user has PERMS_EDIT on.
+     * See Bug: 13837.
+     *
+     * @return array  A hash of tasklist objects.
+     */
+    protected function _getTasklists()
+    {
+        $tasklist_enums = array();
+        $user = $GLOBALS['registry']->getAuth();
+        foreach (Nag::listTasklists(false, Horde_Perms::SHOW, false) as $tl_id => $tl) {
+            if (!$tl->hasPermission($user, Horde_Perms::EDIT)) {
+                continue;
+            }
+            $tasklist_enums[$tl_id] = Nag::getLabel($tl);
+        }
+
+        return $tasklist_enums;
+    }
+
 }