[Merge] lp:~3v1n0/nux/x11-conffile-on-unity-only-x into lp:nux/xenial

[Marco Trevisan (Treviño)]

The proposal to merge lp:~3v1n0/nux/x11-conffile-on-unity-only-x into lp:nux/xenial has been updated.

Commit message changed to:

X11-check-unity-support: only run when called from an unity session

The content of $XDG_CURRENT_DESKTOP is checked inside a sub-shell
not to affect the value of IFS for all the scripts sourced by the X session.

If running in Unity we should call unity_support_test, not inside gnome
ubuntu X sessions.

XDG_CURRENT_DESKTOP values are currently the followings:
 - unity before 17.10: Unity
 - unity after 17.10: Unity:Unity7:ubuntu
 - gnome session: GNOME
 - ubuntu gnome session: ubuntu:GNOME

For more details, see:
https://code.launchpad.net/~3v1n0/nux/x11-conffile-on-unity-only-x/+merge/347864
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