add-apt-repository --remove ppa:username/ppaname does not remove deb-src entry

Fixing bug 399711, we able to create both of 'deb' and 'deb-src' entry into /etc/apt/sources.list.d/username-ppaname-oneiric.list .

However when trying to remove ppa repository using 'sudo add-apt-repository --remove ppa:username/ppaname',
add-apt-repository removes just 'deb' entry only and no touch with 'deb-src' line.

* output of 'lsb_release -rd'
Description: Ubuntu 11.10
Release: 11.10

* output of 'apt-cache policy python-software-properties'
python-software-properties:
  Installed: 0.81.13.1
  Candidate: 0.81.13.1
  Version table:
 *** 0.81.13.1 0
        500 http://jp.archive.ubuntu.com/ubuntu/ oneiric-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.81.10 0
        500 http://jp.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages

* expected to happen
When try to remove PPA repository which former appended using
$ sudo add-apt-repository --remove ppa:username/ppaname
both of 'deb' and 'deb-src' line must be removed from /etc/apt/sources.list.d/username-ppaname-oneiric.list
and it must became zero-length file or removed.

* what happened instead
'deb-src' line still remain in /etc/apt/sources.list.d/username-ppaname-oneiric.list .