foregrounding a sudo'd vim will sometimes break terminal state

[Walter]

See this bug:
http://www.sudo.ws/bugs/show_bug.cgi?id=649

Started on Ubuntu/Trusty since it has a sudo after 1.8.7, (precise has 1.8.3).

Steps to reproduce:

- take a local machine with a recent sudo (after 1.8.7)
- sudo vi
- ^Z (control-Z)
- fg
- repeat ^Z and fg until the fg fails and the screen is partially cleared
- now a second fg wil open vim with a broken terminal state:
  arrow keys will render the escape sequences and other nastiness

Fix is provided upstream, but author is currently figuring out why it breaks.

Cheers,
Walter Doekes
OSSO B.V.

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "SUDO-649_minimal_fix.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Walter (wdoekes)]

That last patch is the sudo author's fix for the issue. Bug is still open.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Benjamin Drung (bdrung)]

The upstream patch got applied as commit b121da2e21cabd2793fc423d84ceddd919fd6e47 and was released in sudo 1.8.11. Therefore this bug is fixed since Ubuntu 16.04 (xenial).