# Buggy code
def _insert_path(self, index, *, clicked=True):
    """Handle an element selection.

    Args:
        index: The QModelIndex of the selected element.
        clicked: Whether the element was clicked.
    """
    path = os.path.normpath(self._file_model.filePath(index))
    if clicked:
        path += os.sep
    else:
        # On Windows, when we have C:\foo and tab over .., we get C:\
        path = path.rstrip(os.sep)

    log.prompt.debug("Inserting path {}".format(path))
    self._lineedit.setText(path)
    self._lineedit.setFocus()
    self._set_fileview_root(path, tabbed=True)
    if clicked:
        # Avoid having a ..-subtree highlighted
        self._file_view.setCurrentIndex(QModelIndex())


# 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 _insert_path(self, index, *, clicked=True):
    """Handle an element selection.

    Args:
        index: The QModelIndex of the selected element.
        clicked: Whether the element was clicked.
    """
    if index == QModelIndex():
        path = os.path.join(self._file_model.rootPath(), self._to_complete)
    else:
        path = os.path.normpath(self._file_model.filePath(index))

    if clicked:
        path += os.sep
    else:
        # On Windows, when we have C:\foo and tab over .., we get C:\
        path = path.rstrip(os.sep)

    log.prompt.debug("Inserting path {}".format(path))
    self._lineedit.setText(path)
    self._lineedit.setFocus()
    self._set_fileview_root(path, tabbed=True)
    if clicked:
        # Avoid having a ..-subtree highlighted
        self._file_view.setCurrentIndex(QModelIndex())