fix #5153 updated: chose whether to respond with empty response or redirection

Check whether header 'X-Requested-With' is not empty, similar as done in HandleExceptions.php
so actual value of the header may change and not affect this behaviour.

Author: BertKoor

app/Http/RequestHandlers/Logout.php

@@ -51,6 +51,12 @@ public function handle(ServerRequestInterface $request): ResponseInterface
             FlashMessages::addMessage(I18N::translate('You have signed out.'));
         }
 
-        return response();
+        if ($request->getHeaderLine('X-Requested-With') !== '') {
+            // Ajax request - send empty response
+            return response();
+        } else {
+            // Form submission - redirect to home page
+            return redirect(HomePage::class);
+        }
     }
 }