Bug#1085880: python3-apt: Package.marked_keep not working

[Benjamin Renard <brenard@easter-eggs.com>]

Package: python3-apt
Version: 2.6.0
Severity: normal

Dear Maintainer,

The Package.marked_keep seem not working properly: all packages are marked to
keep even if it's not the case.

Ex (on Debian Bookworm, v2.6.0):
$ apt-mark showhold
terraform
$ python3
Python 3.11.2 (main, May  2 2024, 11:59:08) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from apt.cache import Cache
>>> cache = Cache()
>>> pkg = cache["apache2"]
>>> pkg.marked_keep
True

I also reproduced this bug on bullseye (v2.2.1) & trixie (v2.9.0+b1).


-- System Information:
Debian Release: 12.7
  APT prefers stable
  APT policy: (990, 'stable'), (500, 'stable-security')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.1.0-9-amd64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_USER, TAINT_OOT_MODULE, TAINT_UNSIGNED_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: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages python3-apt depends on:
ii  distro-info-data   0.58+deb12u2
ii  libapt-pkg6.0      2.6.1
ii  libc6              2.36-9+deb12u8
ii  libgcc-s1          12.2.0-14
ii  libstdc++6         12.2.0-14
ii  python-apt-common  2.6.0
ii  python3            3.11.2-1+b1

Versions of packages python3-apt recommends:
ii  iso-codes    4.15.0-1
ii  lsb-release  12.0-1

Versions of packages python3-apt suggests:
ii  apt             2.6.1
pn  python-apt-doc  <none>

-- debconf-show failed