Comment 1 for bug 1987420

Attaching patch against Debian unstable. For ease of review, relevant commits
and tags have been pushed to the following repository:

https://code.launchpad.net/~waveform/ubuntu/+source/pexpect/+git/pexpect

Specifically:

* logical/4.8.0-2ubuntu1 represents our split-out delta on top of old/debian (4.8.0-2)
* logical/4.8.0-3ubuntu1 represents our rebased delta on top of new/debian (4.8.0-3)
* merge/4.8.0-3ubuntu1 just adds changelog and maintainer changes on top of logical/4.8.0-3ubuntu1

Hence, the following command may produce output useful to the purposes of review:

git range-diff old/debian..logical/4.8.0-2ubuntu1 new/debian..logical/4.8.0-3ubuntu1