Add a warning if QTWEBENGINE_CHROMIUM_FLAGS is set

See #6065

(cherry picked from commit 38fec3726fc0aa518a3637574f7e3e0029df41d4)

1 files changed, 10 insertions, 1 deletions

diff --git a/qutebrowser/config/qtargs.py b/qutebrowser/config/qtargs.py
index 6058931b3..415a76f25 100644
--- a/qutebrowser/config/qtargs.py
+++ b/qutebrowser/config/qtargs.py
@@ -26,7 +26,7 @@ from typing import Any, Dict, Iterator, List, Optional, Sequence, Tuple
 
 from qutebrowser.config import config
 from qutebrowser.misc import objects
-from qutebrowser.utils import usertypes, qtutils, utils
+from qutebrowser.utils import usertypes, qtutils, utils, log
 
 
 _ENABLE_FEATURES = '--enable-features='
@@ -266,6 +266,15 @@ def init_envvars() -> None:
             os.environ['QT_QUICK_BACKEND'] = 'software'
         elif software_rendering == 'chromium':
             os.environ['QT_WEBENGINE_DISABLE_NOUVEAU_WORKAROUND'] = '1'
+
+        qtwe_flags_var = 'QTWEBENGINE_CHROMIUM_FLAGS'
+        qtwe_flags = os.environ.get(qtwe_flags_var)
+        if qtwe_flags is not None:
+            log.init.warning(
+                f"You have {qtwe_flags_var}={qtwe_flags!r} set in your environment. "
+                "This is currently unsupported and interferes with qutebrowser's own "
+                "flag handling (including workarounds for certain crashes). "
+                "Consider using the qt.args qutebrowser setting instead.")
     else:
         assert objects.backend == usertypes.Backend.QtWebKit, objects.backend