gksu handles quoted strings wrongly

[Victor Engmark]

Reported upstream: https://savannah.nongnu.org/bugs/index.php?40023

To reproduce (based on http://askubuntu.com/a/288506/10371):

Compare the first five commands:
echo 'foo\ bar'
sudo echo 'foo\ bar'
gksudo -- echo 'foo\ bar'
gksudo --su-mode -- echo 'foo\ bar'
gksu --sudo-mode -- echo 'foo\ bar'

To this:
gksu -- echo 'foo\ bar'

The last command prints "foo bar" rather than "foo\ bar" (excluding the quotes).

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: gksu 2.0.2-6ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-22.33-generic 3.8.11
Uname: Linux 3.8.0-22-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Sun Jun 2 09:35:52 2013
InstallationDate: Installed on 2012-06-22 (344 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
SourcePackage: gksu
UpgradeStatus: Upgraded to raring on 2013-05-04 (28 days ago)

[Launchpad Janitor (janitor)]

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

[Dario CIPRUT (dciprut)]

Just to confirm the bug subsists in 14.04 LTS.

[Paddy Landau (paddy-landau)]

Bug still present in 16.04 and 16.10.

More information:

http://askubuntu.com/questions/21033/what-is-the-difference-between-gksudo-and-gksu/288506#288506

https://ubuntuforums.org/showthread.php?t=1819589