Bug#903969: reportbug: Reportbug with Urwid crashes when opening text editor

[John Scott <jscott@posteo.net>]

Package: reportbug
Version: 7.5.0
Severity: normal

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When using the most recent Reportbug with Urwid, it crashes when attempting
to open a text editor like this.

Traceback (most recent call last):
  File "/usr/bin/reportbug", line 2266, in <module>
    main()
  File "/usr/bin/reportbug", line 1109, in main
    return iface.user_interface()
  File "/usr/bin/reportbug", line 2182, in user_interface
    package, severity, mode, charset=charset, tags=tags)
  File "/usr/bin/reportbug", line 181, in handle_editing
    (message, changed) = ui.spawn_editor(message or dmessage, filename,
AttributeError: module 'reportbug.ui.urwid_ui' has no attribute 'spawn_editor'

I think this is probably related to the changes in #867337, since GitLab shows
that the commit made this change to urwid_ui.py and removed a couple lines.

from .text_ui import (
    ewrite,
 -  spawn_editor,
 -  system
)

Adding the spawn_editor line back in makes it work again.



- -- Package-specific info:
** Environment settings:
INTERFACE="gtk2"

** /home/john/.reportbugrc:
mode advanced
ui urwid
verify
sign gpg
keyid 27008CC5D05F1B6E18DADAEF7D6144A627793072
paranoid
realname "John Scott"
email "jscott@posteo.net"
smtphost posteo.de:587
smtpuser jscott@posteo.net
smtptls

- -- System Information:
Debian Release: buster/sid
  APT prefers testing-debug
  APT policy: (500, 'testing-debug'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.16.0-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages reportbug depends on:
ii  apt                1.6.3
ii  python3            3.6.5-3
ii  python3-reportbug  7.5.0
ii  sensible-utils     0.0.12

reportbug recommends no packages.

Versions of packages reportbug suggests:
pn  claws-mail                                 <none>
pn  debconf-utils                              <none>
ii  debsums                                    2.2.2
ii  dlocate                                    1.07+nmu1
ii  emacs25-bin-common                         25.2+1-6+b2
ii  exim4-daemon-light [mail-transport-agent]  4.91-5
ii  file                                       1:5.33-3
ii  gnupg                                      2.2.8-3
ii  python3-urwid                              2.0.1-2+b1
ii  reportbug-gtk                              7.5.0
ii  xdg-utils                                  1.1.3-1

Versions of packages python3-reportbug depends on:
ii  apt                1.6.3
ii  file               1:5.33-3
ii  python3            3.6.5-3
ii  python3-apt        1.6.2
ii  python3-debian     0.1.32
ii  python3-debianbts  2.7.2
ii  python3-requests   2.18.4-2

python3-reportbug suggests no packages.

- -- no debconf information

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