From f8a367655597817ed839efd7c913ee189d9c1ce3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20B=C3=BChler?= <stefan.buehler@tik.uni-stuttgart.de>
Date: Thu, 7 Apr 2022 13:56:02 +0200
Subject: [PATCH] only set session (cookie) lang on changes

---
 src/capport/api/lang.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/capport/api/lang.py b/src/capport/api/lang.py
index 5b9b033..e3c1911 100644
--- a/src/capport/api/lang.py
+++ b/src/capport/api/lang.py
@@ -1,9 +1,10 @@
 from __future__ import annotations
 
+import os.path
 import re
 import typing
+
 import quart
-import os.path
 
 from .app import app
 
@@ -53,7 +54,8 @@ def detect_language():
     if 'setlang' in r.args:
         lang = r.args.get('setlang').strip().lower()
         if lang and _VALID_LANGUAGE_NAMES.match(lang):
-            s['lang'] = lang
+            if s.get('lang') != lang:
+                s['lang'] = lang
             g.langs = [lang]
             return
         else: