# Buggy code
def _set_fileview_root(self, path, *, tabbed=False):
    """Set the root path for the file display."""
    separators = os.sep
    if os.altsep is not None:
        separators += os.altsep

    dirname = os.path.dirname(path)

    try:
        if not path:
            pass
        elif path in separators and os.path.isdir(path):
            # Input "/" -> don't strip anything
            pass
        elif path[-1] in separators and os.path.isdir(path):
            # Input like /foo/bar/ -> show /foo/bar/ contents
            path = path.rstrip(separators)
        elif os.path.isdir(dirname) and not tabbed:
            # Input like /foo/ba -> show /foo contents
            path = dirname
        else:
            return
    except OSError:
        log.prompt.exception("Failed to get directory information")
        return

    root = self._file_model.setRootPath(path)
    self._file_view.setRootIndex(root)


# 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 _set_fileview_root(self, path, *, tabbed=False):
    """Set the root path for the file display."""
    separators = os.sep
    if os.altsep is not None:
        separators += os.altsep

    dirname = os.path.dirname(path)
    basename = os.path.basename(path)
    if not tabbed:
        self._to_complete = ""

    try:
        if not path:
            pass
        elif path in separators and os.path.isdir(path):
            # Input "/" -> don't strip anything
            pass
        elif path[-1] in separators and os.path.isdir(path):
            # Input like /foo/bar/ -> show /foo/bar/ contents
            path = path.rstrip(separators)
        elif os.path.isdir(dirname) and not tabbed:
            # Input like /foo/ba -> show /foo contents
            path = dirname
            self._to_complete = basename
        else:
            return
    except OSError:
        log.prompt.exception("Failed to get directory information")
        return

    root = self._file_model.setRootPath(path)
    self._file_view.setRootIndex(root)