Description of problem:
- local Xfce session blocks X2Go Xfce session of same user
- X2Go Xfce session blocks local Xfce session for same user

Version-Release number of selected component (if applicable):
$ rpm -qf /usr/bin/xfce4-session
xfce4-session-4.12.1-9.fc24.x86_64
$ rpm -q x2goserver
x2goserver-4.0.1.19-11.fc24.x86_64
$ rpm -q x2goserver-xsession
x2goserver-xsession-4.0.1.19-11.fc24.x86_64

How reproducible:
100%

Steps to Reproduce:
1. install Fedora 24 x86_64 Xfce
2. dnf install -y "x2go*"
2. log in to Xfce session as 'user'
3. start X2Go Client and connect to localhost as 'user' and a Xfce session

Actual results:
- in X2Go Client status changes to 'Running'
- window for remote computer appears
- some seconds later same window is closed automatically
- in X2Go Client status changes to 'Finished'

Output on Fedora 24 X2Go server is:
$ tail -f /home/user/.xsession-x2go-errors
XSession-x2go: X session started for user at Sat Sep 10 15:09:20 CEST 2016
xfce4-session: Another session manager is already running

Expected results:
like it was in Fedora 22:
- local Xfce session does not block X2Go Xfce session of same user
- X2Go Xfce session does not block local Xfce session for same user


Additional info:
I did not test with Fedora 23.
Test with Fedora 25 alpha-1.2 in VirtualBox 5.0.26: does not display any user interface, after loading kernel. Could not test.


In Fedora 24 choosing non-Xfce entry (f.e. LXDE) as X2Go and local session the connection is established and the session is started and working fine at the same time. No automatic disconnection.


upstream bug report with additional information: http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=1083