Remove service workers based on QtWebEngine version

See https://bugreports.qt.io/browse/QTBUG-93744

qutebrowser/config/configfiles.py

@@ -39,7 +39,7 @@ import qutebrowser
 from qutebrowser.config import (configexc, config, configdata, configutils,
                                 configtypes)
 from qutebrowser.keyinput import keyutils
-from qutebrowser.utils import standarddir, utils, qtutils, log, urlmatch
+from qutebrowser.utils import standarddir, utils, qtutils, log, urlmatch, version
 
 if TYPE_CHECKING:
     from qutebrowser.misc import savemanager
@@ -89,6 +89,7 @@ class StateConfig(configparser.ConfigParser):
         self.read(self._filename, encoding='utf-8')
 
         self.qt_version_changed = False
+        self.qtwe_version_changed = False
         self.qutebrowser_version_changed = VersionChange.unknown
         self._set_changed_attributes()
 
@@ -123,6 +124,10 @@ class StateConfig(configparser.ConfigParser):
         old_qt_version = self['general'].get('qt_version', None)
         self.qt_version_changed = old_qt_version != qVersion()
 
+        old_qtwe_version = self['general'].get('qtwe_version', None)
+        qtwe_version = str(version.qtwebengine_versions(avoid_init=True).webengine)
+        self.qtwe_version_changed = old_qtwe_version != qtwe_version
+
         old_qutebrowser_version = self['general'].get('version', None)
         if old_qutebrowser_version is None:
             # https://github.com/python/typeshed/issues/2093

qutebrowser/misc/backendproblem.py

@@ -389,6 +389,7 @@ class _BackendProblemChecker:
         WORKAROUND for:
         https://bugreports.qt.io/browse/QTBUG-72532
         https://bugreports.qt.io/browse/QTBUG-82105
+        https://bugreports.qt.io/browse/QTBUG-93744
         """
         if ('serviceworker_workaround' not in configfiles.state['general'] and
                 qtutils.version_check('5.14', compiled=False)):
@@ -398,6 +399,8 @@ class _BackendProblemChecker:
             reason = 'Qt 5.14'
         elif configfiles.state.qt_version_changed:
             reason = 'Qt version changed'
+        elif configfiles.state.qtwe_version_changed:
+            reason = 'QtWebEngine version changed'
         elif config.val.qt.workarounds.remove_service_workers:
             reason = 'Explicitly enabled'
         else:

tests/unit/config/test_configfiles.py

@@ -29,7 +29,7 @@ from PyQt5.QtCore import QSettings
 
 from qutebrowser.config import (config, configfiles, configexc, configdata,
                                 configtypes)
-from qutebrowser.utils import utils, usertypes, urlmatch, standarddir
+from qutebrowser.utils import utils, usertypes, urlmatch, standarddir, version
 from qutebrowser.keyinput import keyutils
 
 
@@ -176,6 +176,32 @@ def test_qt_version_changed(state_writer, monkeypatch,
     assert state.qt_version_changed == changed
 
 
+@pytest.mark.parametrize('old_version, new_version, changed', [
+    (None, '5.15.1', False),
+    ('5.15.1', '5.15.1', False),
+    ('5.15.1', '5.15.2', True),
+    ('5.14.0', '5.15.2', True),
+])
+def test_qtwe_version_changed(state_writer, monkeypatch,
+                              old_version, new_version, changed):
+    monkeypatch.setattr(
+        configfiles.version,
+        'qtwebengine_versions',
+        lambda avoid_init=False:
+            version.WebEngineVersions(
+                webengine=utils.VersionNumber.parse(new_version),
+                chromium=None,
+                source='test',
+            )
+    )
+
+    if old_version is not None:
+        state_writer('qtwe_version', old_version)
+
+    state = configfiles.StateConfig()
+    assert state.qtwe_version_changed == changed
+
+
 @pytest.mark.parametrize('old_version, new_version, expected', [
     (None, '2.0.0', configfiles.VersionChange.unknown),
     ('1.14.1', '1.14.1', configfiles.VersionChange.equal),