Fix exception when quitting with download prompt open
If we have a pending download with a prompt and quit qutebrowser, we get:
mainwindow:closeEvent:715 Closing window 0
quitter:shutdown:221 Shutting down with status 0, session None...
prompt:shutdown:121 Shutting down with loops [<qutebrowser.utils.qtutils.EventLoop object at 0x7fa034725770>]
quitter:shutdown:235 Deferring shutdown stage 2
prompt:ask_question:179 Ending loop.exec() for <qutebrowser.utils.usertypes.Question default='/tmp/qbdl/download/' mode=<PromptMode.download: 5> option=None text='Please enter a location for <b>https://proof.ovh.net/files/1Mb.dat</b>' title='Save file to:'>
prompt:ask_question:181 Restoring old question None
prompt:_on_show_prompts:299 Deleting old prompt qutebrowser.mainwindow.prompt.DownloadFilenamePrompt(question=<qutebrowser.utils.usertypes.Question default='/tmp/qbdl/download/' mode=<PromptMode.download: 5> option=None text='Please enter a location for <b>https://proof.ovh.net/files/1Mb.dat</b>' title='Save file to:'>)
prompt:_on_show_prompts:303 No prompts left, hiding prompt container.
objreg:on_destroyed:112 schedule removal: 0
objreg:on_destroyed:112 schedule removal: tab
[...]
objreg:on_destroyed:112 schedule removal: 0
objreg:on_destroyed:112 schedule removal: main-window
objreg:on_destroyed:112 schedule removal: tabbed-browser
objreg:on_destroyed:112 schedule removal: status-command
objreg:on_destroyed:112 schedule removal: completion
objreg:on_destroyed:112 schedule removal: mode-manager
objreg:on_destroyed:112 schedule removal: hintmanager
objreg:on_destroyed:112 schedule removal: prompt-container
quitter:_shutdown_2:241 Stage 2 of shutting down...
[...]
webenginedownloads:_on_state_changed:63 State for <qutebrowser.browser.webengine.webenginedownloads.DownloadItem basename='1Mb.dat'> changed to DownloadCancelled
downloads:_on_begin_remove_row:1076 _on_begin_remove_row with idx 0, webengine True
downloads:_remove_item:995 Removed download 1: 1Mb.dat [100%|?.??B]
modeman:leave:429 Leaving mode KeyMode.prompt (reason: aborted)
crashsignal:_handle_early_exits:229 Uncaught exception
Traceback (most recent call last):
File "[...]/qutebrowser/mainwindow/prompt.py", line 344, in _on_aborted
modeman.leave(self._win_id, key_mode, 'aborted', maybe=True)
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "[...]/qutebrowser/keyinput/modeman.py", line 214, in leave
instance(win_id).leave(mode, reason, maybe=maybe)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "[...]/qutebrowser/keyinput/modeman.py", line 435, in leave
self.left.emit(mode, self.mode, self._win_id)
^^^^^^^^^
RuntimeError: wrapped C/C++ object of type ModeManager has been deleted
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