Comment 3 for bug 1569926

I have tested this by creating 2 versions of a package where the first creates the configuration file /etc/test/test1.conf (test1.deb) and the second creates the configuration file /etc/test/test2.conf (test2.deb). On installing test1.deb and then test2.deb only the file /etc/test/test2.conf exists so dpkg does clean up obsolete configuration files. But it seems this does not happen if a package gets reinstalled as sayed in comment #1.