I updated TW to current snapshot and was kicked out of GUI. I'm using XFCE installation pattern with lightdm; I do not see anything related to service restart in lightdm, but I see that xdm was updated (1.1.11-17.1 -> 1.1.11-18.1). Is it (loss of GUI session) expected in this case? Even if this is fallout of %postuninstall of previous version - I'm using lightdm as display manager, why updating of *xdm* restarts it?