Fix session reliability issue on Xenial

.gitignore

@@ -1,5 +1,6 @@
 *.swp
 *~
+debian/debhelper-build-stamp
 debian/files
 debian/gnome-session-xmonad/
 debian/gnome-session-xmonad.debhelper.log

debian/changelog

@@ -1,3 +1,12 @@
+gnome-session-xmonad (1.0-1xenial1) xenial; urgency=medium
+
+  * Make sure gnome-xmonad is listed in /etc/upstart-xsessions. Current Ubuntu
+    scripts /etc/X11/Xsession.d check this, and the session does not work
+    reliably without it
+  * Depend on upstart to ensure /etc/upstart-xsessions exists
+
+ -- Joonas Javanainen <joonas.javanainen@gmail.com>  Sat, 16 Jul 2016 14:50:33 +0300
+
 gnome-session-xmonad (1.0-0xenial1) xenial; urgency=medium
 
   * Initial release for Xenial

debian/control

@@ -10,6 +10,7 @@ Package: gnome-session-xmonad
 Architecture: all
 Depends: gnome-session-flashback,
          xmonad (>= 0.11-9),
-         libghc-xmonad-contrib-dev (>= 0.11.3-3)
+         libghc-xmonad-contrib-dev (>= 0.11.3-3),
+         upstart,
          ${misc:Depends}
 Description: GNOME Session Manager - XMonad session

debian/postinst

@@ -0,0 +1,11 @@
+#!/bin/sh
+set -e
+
+# Make sure we are listed in upstart-xsessions
+if ! grep -qxF 'gnome-xmonad' /etc/upstart-xsessions; then
+    echo 'gnome-xmonad' >> /etc/upstart-xsessions
+fi
+
+#DEBHELPER#
+
+exit 0