All regressions now cleared after a re-run (thanks!), and verifications
done.

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https://bugs.launchpad.net/bugs/1311056

Title:
  [SRU] apt-add-repository adds duplicate commented/disabled source
  lines

Status in python-apt package in Ubuntu:
  Fix Released
Status in python-apt source package in Xenial:
  Fix Committed
Status in python-apt source package in Bionic:
  Fix Committed
Status in python-apt source package in Eoan:
  Fix Committed

Bug description:
  Impact
  ======

  Under most circumstances, the impact is minimal (a few extra redundant
  comment lines in apt sources. However, if users are automating source
  removal / addition on a machine (as in comment 11), there is the
  potential to wind up with an excessively large (and thus slow to
  parse) apt sources configuration.

  Test packages for the supported releases are available from the
  following PPA:

  https://launchpad.net/~waveform/+archive/ubuntu/python-apt

  Built from the source which can be found in the following branches:

  https://code.launchpad.net/~waveform/ubuntu/+source/python-apt/+git
  /python-apt/+ref/sru-dupe-ppa-xenial

  https://code.launchpad.net/~waveform/ubuntu/+source/python-apt/+git
  /python-apt/+ref/sru-dupe-ppa-bionic

  https://code.launchpad.net/~waveform/ubuntu/+source/python-apt/+git
  /python-apt/+ref/sru-dupe-ppa-eoan

  Test Case
  =========

  * sudo add-apt-repository -y ppa:deadsnakes/ppa
  * cat /etc/apt/sources.list.d/deadsnakes*.list
  * Note the presence of one uncommented "deb" line, and one commented 
"deb-src" line
  * sudo add-apt-repository -y ppa:deadsnakes/ppa
  * cat /etc/apt/sources.list.d/deadsnakes*.list
  * Note the uncommented "deb" line is still there but the commented "deb-src" 
line has now been duplicated
  * sudo add-apt-repository ppa:waveform/python-apt
  * sudo apt upgrade  # update python-apt to fixed version
  * sudo add-apt-repository -y ppa:deadsnakes/ppa
  * cat /etc/apt/sources.list.d/deadsnakes*.list
  * Note there has been no further duplication of the commented "deb-src" line

  Regression Potential
  ====================

  Minimal; test cases have been added to cover the duplication case, and
  to cover the enabling of sources (which was not covered by existing
  tests, but was part of the code altered to fix the duplication case),
  and insertion of sources at a position (again, not covered by existing
  tests but modified as part of the fix). The test case has been used
  successfully on all targeted releases (xenial, bionic, and eoan).

  Original Description
  ====================

  Trusty Tahr 14.04

  0 root@osprey:/etc/apt/sources.list.d#cat aims-aims-desktop-trusty.list
  deb http://ppa.launchpad.net/aims/aims-desktop/ubuntu trusty main
  # deb-src http://ppa.launchpad.net/aims/aims-desktop/ubuntu trusty main
  0 root@osprey:/etc/apt/sources.list.d#apt-add-repository -y 
ppa:aims/aims-desktop
  gpg: keyring `/tmp/tmp0ufdhnmv/secring.gpg' created
  gpg: keyring `/tmp/tmp0ufdhnmv/pubring.gpg' created
  gpg: requesting key BE796FF2 from hkp server keyserver.ubuntu.com
  gpg: /tmp/tmp0ufdhnmv/trustdb.gpg: trustdb created
  gpg: key BE796FF2: public key "Launchpad PPA for AIMS" imported
  gpg: Total number processed: 1
  gpg:               imported: 1  (RSA: 1)
  OK
  0 root@osprey:/etc/apt/sources.list.d#cat aims-aims-desktop-trusty.list deb 
http://ppa.launchpad.net/aims/aims-desktop/ubuntu trusty main
  # deb-src http://ppa.launchpad.net/aims/aims-desktop/ubuntu trusty main
  # deb-src http://ppa.launchpad.net/aims/aims-desktop/ubuntu trusty main
  0 root@osprey:/etc/apt/sources.list.d#

  That deb-src line should have stayed commented out, and not been
  duplicated. (Commented deb lines should of course be uncommented, as
  already fixed per https://bugs.launchpad.net/ubuntu/+source/python-
  apt/+bug/1042916 .)

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