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

src/Auth/User.php

@@ -2,6 +2,7 @@
 
 namespace EesyPHP\Auth;
 
+use EesyPHP\Hook;
 use EesyPHP\Log;
 use function EesyPHP\ensure_is_array;
 use function EesyPHP\vardump;
@@ -135,17 +136,24 @@ class User {
    */
   public function save() {
     if (!isset($this -> original_user)) {
-      Log::debug("%s->save(): no change to save", $this);
+      Log::debug("%s->save(): original_user not set, no change to save.", $this);
       return true;
     }
     $changes = [];
     foreach ($this->info as $attr => $value)
       if ($this->original_user->$attr != $value)
         $changes[$attr] = $value;
-    return call_user_func(
+    if (!$changes) {
+      Log::debug("%s->save(): no info updated, no change to save", $this);
+      return true;
+    }
+    $result = call_user_func(
       array($this -> backend, 'update_user'),
       $this -> original_user, $changes, true
     );
+    if ($result)
+      Hook::trigger("user_updated", ["user" => $this, "changes" => $changes]);
+    return $result;
   }
 
 }