Public bug reported:

The session detection for gtk3-nocsd doesn't work properly as it still
uses old session detection method of gnomerc. It tries to detect the
session by shipping 51gtk3-nocsd-detect in /etc/X11/Xsession.d.

51gtk3-nocsd-detect uses:

1) `BASESTARTUP=${STARTUP%% *}` which fails as STARTUP was never set on
Ubuntu

2) `BASESTARTUP=$(basename $(readlink /etc/alternatives/x-session-
manager))` which will fail(it never goes into the inner loop due to
previous error) for unity session as unity session also uses gnome-
session but wants to set GTK_CSD=0 globally.

The modern way to detect session is to use $XDG_CURRENT_DESKTOP
variable. I attached a patch which takes advantage of that.

** Affects: gtk3-nocsd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bionic

** Patch added: "improve-session-detection.patch"
   
https://bugs.launchpad.net/bugs/1745206/+attachment/5042463/+files/improve-session-detection.patch

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https://bugs.launchpad.net/bugs/1745206

Title:
  Improve session detection

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