# Buggy code
def _connect_tab_signals(self, tab):
    """Set up the needed signals for tab."""
    # filtered signals
    tab.link_hovered.connect(self._filter.create(self.cur_link_hovered, tab))
    tab.load_progress.connect(self._filter.create(self.cur_progress, tab))
    tab.load_finished.connect(self._filter.create(self.cur_load_finished, tab))
    tab.load_started.connect(self._filter.create(self.cur_load_started, tab))
    tab.scroller.perc_changed.connect(
        self._filter.create(self.cur_scroll_perc_changed, tab)
    )
    tab.url_changed.connect(self._filter.create(self.cur_url_changed, tab))
    tab.load_status_changed.connect(
        self._filter.create(self.cur_load_status_changed, tab)
    )
    tab.fullscreen_requested.connect(
        self._filter.create(self.cur_fullscreen_requested, tab)
    )
    # misc
    tab.scroller.perc_changed.connect(self.on_scroll_pos_changed)
    tab.url_changed.connect(functools.partial(self.on_url_changed, tab))
    tab.title_changed.connect(functools.partial(self.on_title_changed, tab))
    tab.icon_changed.connect(functools.partial(self.on_icon_changed, tab))
    tab.load_progress.connect(functools.partial(self.on_load_progress, tab))
    tab.load_finished.connect(functools.partial(self.on_load_finished, tab))
    tab.load_started.connect(functools.partial(self.on_load_started, tab))
    tab.window_close_requested.connect(
        functools.partial(self.on_window_close_requested, tab)
    )
    tab.renderer_process_terminated.connect(
        functools.partial(self._on_renderer_process_terminated, tab)
    )
    tab.new_tab_requested.connect(self.tabopen)
    if not self.private:
        web_history = objreg.get("web-history")
        tab.add_history_item.connect(web_history.add_from_tab)


# 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 _connect_tab_signals(self, tab):
    """Set up the needed signals for tab."""
    # filtered signals
    tab.link_hovered.connect(self._filter.create(self.cur_link_hovered, tab))
    tab.load_progress.connect(self._filter.create(self.cur_progress, tab))
    tab.load_finished.connect(self._filter.create(self.cur_load_finished, tab))
    tab.load_started.connect(self._filter.create(self.cur_load_started, tab))
    tab.scroller.perc_changed.connect(
        self._filter.create(self.cur_scroll_perc_changed, tab)
    )
    tab.url_changed.connect(self._filter.create(self.cur_url_changed, tab))
    tab.load_status_changed.connect(
        self._filter.create(self.cur_load_status_changed, tab)
    )
    tab.fullscreen_requested.connect(
        self._filter.create(self.cur_fullscreen_requested, tab)
    )
    tab.caret.selection_toggled.connect(
        self._filter.create(self.cur_caret_selection_toggled, tab)
    )
    # misc
    tab.scroller.perc_changed.connect(self.on_scroll_pos_changed)
    tab.url_changed.connect(functools.partial(self.on_url_changed, tab))
    tab.title_changed.connect(functools.partial(self.on_title_changed, tab))
    tab.icon_changed.connect(functools.partial(self.on_icon_changed, tab))
    tab.load_progress.connect(functools.partial(self.on_load_progress, tab))
    tab.load_finished.connect(functools.partial(self.on_load_finished, tab))
    tab.load_started.connect(functools.partial(self.on_load_started, tab))
    tab.window_close_requested.connect(
        functools.partial(self.on_window_close_requested, tab)
    )
    tab.renderer_process_terminated.connect(
        functools.partial(self._on_renderer_process_terminated, tab)
    )
    tab.new_tab_requested.connect(self.tabopen)
    if not self.private:
        web_history = objreg.get("web-history")
        tab.add_history_item.connect(web_history.add_from_tab)