From f17ef8a3a190332450f69f92b9f251ef2caeabc8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois?= <francois@beafrancois.fr>
Date: Thu, 7 May 2026 10:03:54 +0200
Subject: [PATCH] dialog_env: pick wayland/xcb from $DISPLAY/$WAYLAND_DISPLAY

Was forcing xcb unconditionally, which hung dialogs on pure-Wayland sessions.
---
 src/testium/interpreter/test_items/dialog_env.py | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/testium/interpreter/test_items/dialog_env.py b/src/testium/interpreter/test_items/dialog_env.py
index 35d690e..29199ac 100644
--- a/src/testium/interpreter/test_items/dialog_env.py
+++ b/src/testium/interpreter/test_items/dialog_env.py
@@ -10,6 +10,8 @@ import os
 def setup():
     """Configure the Qt environment for dialog subprocess usage."""
     if sys.platform.startswith('linux'):
-        # On Linux/Wayland, force X11 (via XWayland) to avoid crashes
-        # when Qt is initialized inside a multiprocessing subprocess.
-        os.environ['QT_QPA_PLATFORM'] = 'xcb'
+        if os.environ.get('DISPLAY'):
+            # X11 available: force xcb to avoid crashes in multiprocessing subprocesses.
+            os.environ['QT_QPA_PLATFORM'] = 'xcb'
+        elif os.environ.get('WAYLAND_DISPLAY'):
+            os.environ['QT_QPA_PLATFORM'] = 'wayland'