Bug#335925: apt-cache rdepends shows duplicated reverse dependencies/dependants

[Filipus Klutiero <cheal@hotpop.com>]

Package: apt
Version: 0.6.42.1
Severity: minor

For example,
$ apt-cache rdepends kdeedu
kdeedu
Reverse Depends:
  kdeedu-doc-html
  kdeedu-data
  kdelibs4
  kdeedu-doc-html
  kdeedu-data
  kde-amusements

This seems to be due to use of a mix. Originally reported against
synaptic, #291931
	    

-- Package-specific info:

-- apt-config dump --

APT "";
APT::Architecture "i386";
APT::Build-Essential "";
APT::Build-Essential:: "build-essential";
APT::Default-Release "testing";
Dir "/";
Dir::State "var/lib/apt/";
Dir::State::lists "lists/";
Dir::State::cdroms "cdroms.list";
Dir::State::userstatus "status.user";
Dir::State::status "/var/lib/dpkg/status";
Dir::Cache "var/cache/apt/";
Dir::Cache::archives "archives/";
Dir::Cache::srcpkgcache "srcpkgcache.bin";
Dir::Cache::pkgcache "pkgcache.bin";
Dir::Etc "etc/apt/";
Dir::Etc::sourcelist "sources.list";
Dir::Etc::vendorlist "vendors.list";
Dir::Etc::vendorparts "vendors.list.d";
Dir::Etc::main "apt.conf";
Dir::Etc::parts "apt.conf.d";
Dir::Etc::preferences "preferences";
Dir::Bin "";
Dir::Bin::methods "/usr/lib/apt/methods";
Dir::Bin::dpkg "/usr/bin/dpkg";
DPkg "";
DPkg::Pre-Install-Pkgs "";
DPkg::Pre-Install-Pkgs:: "if dpkg -s apt-listbugs | grep -q '^Status: .* ok installed'; then /usr/sbin/apt-listbugs apt || ( test $? -ne 10 || exit 10; echo 'Warning: apt-listbugs exited abnormally, hit enter key to continue.' 1>&2 ; read a < /dev/tty ); fi";
DPkg::Pre-Install-Pkgs:: "/usr/bin/apt-listchanges --apt || test $? -ne 10";
DPkg::Pre-Install-Pkgs:: "/usr/sbin/dpkg-preconfigure --apt || true";
DPkg::Tools "";
DPkg::Tools::Options "";
DPkg::Tools::Options::/usr/bin/apt-listchanges "";
DPkg::Tools::Options::/usr/bin/apt-listchanges::Version "2";
DPkg::Post-Invoke "";
DPkg::Post-Invoke:: "if [ -x /usr/bin/debsums ]; then /usr/bin/debsums --generate=nocheck -sp /var/cache/apt/archives; fi";

-- (no /etc/apt/preferences present) --


-- /etc/apt/sources.list --

# deb file:///cdrom/ etch main

deb cdrom:[Debian GNU/Linux testing _Etch_ - Official Snapshot i386 Binary-1 (20050827)]/ etch contrib main

# deb http://security.debian.org/ testing/updates main contrib
deb http://secure-testing.debian.net/debian-secure-testing etch/security-updates main contrib non-free
deb http://dolly.ift.ulaval.ca/debian/ etch main contrib non-free
deb http://dolly.ift.ulaval.ca/debian/ sid main contrib non-free
#deb http://gulus.usherbrooke.ca/debian/ testing main contrib non-free
#deb-src http://gulus.usherbrooke.ca/debian/ testing main
#deb-src http://gulus.usherbrooke.ca/debian/ sid main

#deb http://www.backports.org/~mkoch/unstable/ ./


-- System Information:
Debian Release: testing/unstable
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.12-z71a-4
Locale: LANG=fr_CA, LC_CTYPE=fr_CA (charmap=ISO-8859-1)

Versions of packages apt depends on:
ii  libc6                         2.3.5-6    GNU C Library: Shared libraries an
ii  libgcc1                       1:4.0.2-2  GCC support library
ii  libstdc++6                    4.0.2-2    The GNU Standard C++ Library v3

apt recommends no packages.

-- no debconf information