Bug#1021481: reportbug: -r always create a new bug even when replying

[Nicolas Cavallari <batchman@free.fr>]

Package: reportbug
Version: 11.5.1
Severity: normal


When trying to provide additional information to an existing bug, a
configuration problem from my side prevented reportbug from sending a
mail.  reportbug then suggested to use "reportbug -r /tmp/[...]" to
resume the submission.

However, this option made reportbug send the mail to submit@ instead of
replying to the existing bug number.  This created a new bug, even if
the existing bug number was present in the "Followup-For" pseudo-header.

See #1021480 for such a junk bug.

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

** $HOME/.reportbugrc:
reportbug_version "11.5.1"
mode advanced
ui text
realname "Nicolas Cavallari"
email "batchman@free.fr"
smtphost "smtp.free.fr:587"
smtpuser "batchman"
smtptls

-- System Information:
Debian Release: bookworm/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.19.0-2-amd64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: sysvinit (via /sbin/init)
LSM: AppArmor: enabled

Versions of packages reportbug depends on:
ii  apt                2.5.3
ii  python3            3.10.6-1
ii  python3-reportbug  11.5.1
ii  sensible-utils     0.0.17

reportbug recommends no packages.

Versions of packages reportbug suggests:
pn  claws-mail                      <none>
ii  debconf                         1.5.79
ii  debsums                         3.0.2
pn  dlocate                         <none>
pn  emacs-bin-common                <none>
ii  file                            1:5.41-4
ii  gnupg                           2.2.39-1
ii  postfix [mail-transport-agent]  3.6.4-1+b3
pn  python3-urwid                   <none>
pn  reportbug-gtk                   <none>
ii  xdg-utils                       1.1.3-4.1

Versions of packages python3-reportbug depends on:
ii  apt                2.5.3
ii  file               1:5.41-4
ii  python3            3.10.6-1
ii  python3-apt        2.3.0+b2
ii  python3-debian     0.1.48
ii  python3-debianbts  3.2.3
ii  python3-requests   2.27.1+dfsg-1
ii  sensible-utils     0.0.17

python3-reportbug suggests no packages.

-- no debconf information