save the page-orderby per user

Bug 1360535: Save the last chosen order for pages in the user settings. Load
that as a default when nothing is selected by the user

Change-Id: I28a9461fb74c7ffef7753a145b1da0e9100f2e15
Signed-off-by: Tobias Zeuch <tobias.zeuch@kit.edu>

htdocs/lib/user.php

@@ -213,6 +213,7 @@ function expected_account_preferences() {
                  'devicedetection' => 1,
                  'licensedefault' => '',
                  'viewsperpage' => 20,
+                 'orderpagesby' => 'atoz',
                  );
 }
 

htdocs/lib/view.php

@@ -3622,7 +3622,12 @@ class View {
             $limit = $userlimit;
         }
         $offset = param_integer('offset', 0);
-        $orderby = param_variable('orderby', null);
+        // load default page order from user settings as default and overwrite, if changed
+        $usersettingorderby = get_account_preference($USER->get('id'), 'orderpagesby');
+        $orderby = param_variable('orderby', $usersettingorderby);
+        if ($usersettingorderby !== $orderby) {
+            set_account_preference($USER->get('id'), 'orderpagesby', $orderby);
+        }
 
         $query  = param_variable('query', null);
         $tag    = param_variable('tag', null);