# Buggy code
def qt_args(namespace):
    """Get the Qt QApplication arguments based on an argparse namespace.

    Args:
        namespace: The argparse namespace.

    Return:
        The argv list to be passed to Qt.
    """
    argv = [sys.argv[0]]

    if namespace.qt_flag is not None:
        argv += ["--" + flag[0] for flag in namespace.qt_flag]

    if namespace.qt_arg is not None:
        for name, value in namespace.qt_arg:
            argv += ["--" + name, value]

    argv += ["--" + arg for arg in config.val.qt.args]
    return argv


# Traceback (ValueError)
16:39:44 DEBUG    init       app:_init_modules:468 Initializing websettings...
16:39:45 ERROR    misc       crashsignal:exception_hook:216 Uncaught exception
Traceback (most recent call last):
File "/bin/qutebrowser", line 11, in <module>
load_entry_point('qutebrowser==1.1.1', 'gui_scripts', 'qutebrowser')()
File "/usr/lib/python3.6/site-packages/qutebrowser/qutebrowser.py", line 188, in main
return app.run(args)
File "/usr/lib/python3.6/site-packages/qutebrowser/app.py", line 137, in run
init(args, crash_handler)
File "/usr/lib/python3.6/site-packages/qutebrowser/app.py", line 163, in init
_init_modules(args, crash_handler)
File "/usr/lib/python3.6/site-packages/qutebrowser/app.py", line 469, in _init_modules
websettings.init(args)
File "/usr/lib/python3.6/site-packages/qutebrowser/config/websettings.py", line 215, in init
webenginesettings.init(args)
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/webenginesettings.py", line 297, in init
websettings.init_mappings(MAPPINGS)
File "/usr/lib/python3.6/site-packages/qutebrowser/config/websettings.py", line 198, in init_mappings
mapping.set(value)
File "/usr/lib/python3.6/site-packages/qutebrowser/config/websettings.py", line 72, in set
self._set(value, settings=settings)
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/webenginesettings.py", line 154, in _set
filenames = [self._find_installed(code) for code in value]
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/webenginesettings.py", line 154, in <listcomp>
filenames = [self._find_installed(code) for code in value]
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/webenginesettings.py", line 143, in _find_installed
local_filename = spell.local_filename(code)
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/spell.py", line 64, in local_filename
all_installed = local_files(code)
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/spell.py", line 51, in local_files
for matching_dict in sorted(matching_dicts, key=version, reverse=True):
File "/usr/lib/python3.6/site-packages/qutebrowser/browser/webengine/spell.py", line 36, in version
.format(filename))
ValueError: the given dictionary file name is malformed: /usr/share/qt/qtwebengine_dictionaries/en-US.bdic

# Fixed code
def qt_args(namespace):
    """Get the Qt QApplication arguments based on an argparse namespace.

    Args:
        namespace: The argparse namespace.

    Return:
        The argv list to be passed to Qt.
    """
    argv = [sys.argv[0]]

    if namespace.qt_flag is not None:
        argv += ["--" + flag[0] for flag in namespace.qt_flag]

    if namespace.qt_arg is not None:
        for name, value in namespace.qt_arg:
            argv += ["--" + name, value]

    argv += ["--" + arg for arg in config.val.qt.args]

    if objects.backend == usertypes.Backend.QtWebEngine and not qtutils.version_check(
        "5.11", compiled=False
    ):
        # WORKAROUND equivalent to
        # https://codereview.qt-project.org/#/c/217932/
        # Needed for Qt < 5.9.5 and < 5.10.1
        argv.append("--disable-shared-workers")

    return argv