Don't create QWebEngine profile at import time

Fixes #2378

qutebrowser/browser/webengine/webenginesettings.py

@@ -71,17 +71,18 @@ class ProfileSetter(websettings.Base):
 
     def __init__(self, getter, setter):
         super().__init__()
-        profile = QWebEngineProfile.defaultProfile()
-        self._getter = getattr(profile, getter)
-        self._setter = getattr(profile, setter)
+        self._getter = getter
+        self._setter = setter
 
     def get(self, settings=None):
         utils.unused(settings)
-        return self._getter()
+        getter = getattr(QWebEngineProfile.defaultProfile(), self._getter)
+        return getter()
 
     def _set(self, value, settings=None):
         utils.unused(settings)
-        self._setter(value)
+        setter = getattr(QWebEngineProfile.defaultProfile(), self._setter)
+        setter(value)
 
 
 class PersistentCookiePolicy(ProfileSetter):
@@ -98,7 +99,8 @@ class PersistentCookiePolicy(ProfileSetter):
 
     def _set(self, value, settings=None):
         utils.unused(settings)
-        self._setter(
+        setter = getattr(QWebEngineProfile.defaultProfile(), self._setter)
+        setter(
             QWebEngineProfile.AllowPersistentCookies if value else
             QWebEngineProfile.NoPersistentCookies
         )

tests/end2end/test_invocations.py

@@ -19,6 +19,7 @@
 
 """Test starting qutebrowser with special arguments/environments."""
 
+import socket
 import sys
 import logging
 import re
@@ -202,3 +203,19 @@ def test_qt_arg(request, quteproc_new, tmpdir):
 
     quteproc_new.send_cmd(':quit')
     quteproc_new.wait_for_quit()
+
+
+def test_webengine_inspector(request, quteproc_new):
+    if not request.config.webengine:
+        pytest.skip()
+    args = (['--temp-basedir', '--enable-webengine-inspector'] +
+            _base_args(request.config))
+    quteproc_new.start(args)
+    line = quteproc_new.wait_for(
+        message='Remote debugging server started successfully. Try pointing a '
+                'Chromium-based browser to http://127.0.0.1:*')
+    port = int(line.message.split(':')[-1])
+
+    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    s.connect(('127.0.0.1', port))
+    s.close()