Url::get_absolute_url(): fix checking if the public root URL is relative

src/Auth/Ldap.php

@@ -285,6 +285,7 @@ class Ldap extends Backend {
     $updated_attrs = [];
     $deleted_attrs = [];
     foreach($changes as $attr => $value) {
+      if ($attr == "dn") continue;
       if (!array_key_exists($attr, $attrs)) {
         Log::error(
           "Ldap::update_user(%s): Changes on unknown attribute %s provided",

src/Auth/User.php

@@ -4,6 +4,7 @@ namespace EesyPHP\Auth;
 
 use EesyPHP\Log;
 use function EesyPHP\ensure_is_array;
+use function EesyPHP\vardump;
 
 class User {
 
@@ -72,6 +73,7 @@ class User {
    * @return void
    */
   public function __set($key, $value) {
+    Log::trace("%s->__set(%s): new value=%s", $this, $key, vardump($value));
     switch ($key) {
       case 'username':
         $this -> username = strval($value);
@@ -132,7 +134,10 @@ class User {
    * @return bool
    */
   public function save() {
-    if (!isset($this -> original_user)) return true;
+    if (!isset($this -> original_user)) {
+      Log::debug("%s->save(): no change to save", $this);
+      return true;
+    }
     return call_user_func(
       array($this -> backend, 'update_user'),
       $this -> original_user, $this -> info, true