Comment # 79 on bug 968405 from Egbert Eich

(In reply to Andrei Borzenkov from comment #78)
> 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?

Andrei, Since the faulty code is in the uninstall scriptlet of the *old*
package this will happen until a *fixed* package is updated ie gets
uninstalled. The uninstall scriptlets of a package(-version) are stored in the
rpm database until this package(-version) is removed completely.
So even though the issue is fixed, you will suffer from it once more. Only the
next time around, when this package is updated *again* you should be fine.