I couldn't reproduce this behaviour in a fresh Jessie install with desktop=xfce. It's probably fixed in 4.10, especially since there is no xfce4-settings-helper.
Apparently the bug is not going to be fixed upstream in 4.8. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
