Crash on CTRL-Z

[joshnatis]

Hi there, thank you for your hard work on this great software :).

Part of my workflow is backgrounding the Python REPL with CTRL-Z and then bringing it back up with fg. This causes bpython to crash.

Reproducer and error trace:

$ bpython
bpython version 0.23 on top of Python 3.8.10 /usr/bin/python3
>>>
CTRL-Z
[4]+  Stopped                 bpython

$ fg
Traceback (most recent call last):
  File "/home/josh/.local/bin/bpython", line 8, in <module>
    sys.exit(main())
  File "/home/josh/.local/lib/python3.8/site-packages/bpython/curtsies.py", line 248, in main
    repl.mainloop(True, paste)
  File "/home/josh/.local/lib/python3.8/site-packages/bpython/curtsies.py", line 180, in mainloop
    for e in inputs:
  File "/home/josh/.local/lib/python3.8/site-packages/bpython/curtsies.py", line 261, in _combined_events
    e = event_provider.send(timeout)
  File "/home/josh/.local/lib/python3.8/site-packages/curtsies/input.py", line 238, in send
    return self._send(timeout)
  File "/home/josh/.local/lib/python3.8/site-packages/curtsies/input.py", line 290, in _send
    stdin_ready_for_read, event = self._wait_for_read_ready_or_timeout(
  File "/home/josh/.local/lib/python3.8/site-packages/curtsies/input.py", line 198, in _wait_for_read_ready_or_timeout
    (rs, _, _) = select.select(
  File "/home/josh/.local/lib/python3.8/site-packages/bpython/curtsiesfrontend/repl.py", line 662, in sigtstp_handler
    self.after_suspend()
  File "/home/josh/.local/lib/python3.8/site-packages/bpython/curtsies.py", line 132, in after_suspend
    self.window.__enter__()
  File "/home/josh/.local/lib/python3.8/site-packages/curtsies/window.py", line 287, in __enter__
    self.cbreak.__enter__()
  File "/usr/lib/python3.8/contextlib.py", line 111, in __enter__
    del self.args, self.kwds, self.func
AttributeError: args

[joshnatis]

Thanks for the super quick turnaround time!!!