"Switch user" button missing when Xfce4-screensaver is launched by systemd

Submitted by Beguam

Assigned to Sean Davis @bluesabre

Link to original bug (#16626)

Description

On the dialog windows for unlock the screensaver, "Switch user" button is missing. This occurs when Xfce4-screensaver is launched by systemd (auto-launch with session start)

If I kill xfce4-screensaver, then re-launch it, lock screen -> "Switch user" button is present

-- OS : OpenSUSE Leap 15.1 Xfce 4.14.2 xfce4-screensaver 0.1.10-lp151.17.1

Version: 0.1.10