Log Message:
Update XFCE4 to 4.18.0, part 2.

xfce4-appfinder, xfce4-power-manager, xfce4-thunar, xfce4-wm,
xfce4-desktop, xfce4-garcon, xfce4-panel, xfce4-settings

The full changelog (long) can be found at
https://www.xfce.org/download/changelogs/4.18.