Geany is not able to guarantee it will save its session before it is crashed by 
logout or shutdown.  

There is a race between when Geany is signalled to close and when the 
logout/shutdown crashes Geany.  That race is what means it works sometimes, but 
not every time, it totally depends on Geany access to the CPU, the disk IO etc 
in the time it has available, and remember those resources are shared with lots 
of other processes that you don't close, so there is no guarantee that Geany 
will get the resources it needs to complete saving the session.  

Also it will be worse if a modified buffer is open since Geany will ask before 
saving it, but the user won't have a chance of responding so it just waits.  
Needs #3733 to remove that issue, then it may be possible to save session ahead 
of time so nothing needs to be saved at shutdown.  

If it does not complete saving the session file may be left broken, so it gets 
rewritten to defaults some times.

There is no cross platform session management library at the moment despite GTK 
having an API for it, Gnome uses dbus, dunno what XFCE, KDE and other distros 
use, X11 has a session management library, and Windows and Macos are different 
again.  At the moment applications are left with the sad choice of either 
specialising in a particular platform, or being cross platform and not being 
integrated with any session management, or using a lot of effort to support 
many platforms.

 Geany is cross platform and does not have the effort to support each platform 
itself, so no session management happens and so the problem.  



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