MarsSeed [1] filed a deletion request for xfce4-wmdock-plugin [2]: Broken, EOL Gtk2 based plugin from 2013. Not compatible with the current Gtk3 based xfce4 packages.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/xfce4-wmdock-plugin/
