MarsSeed [1] filed a deletion request for xfwm4-gtk2 [2]: Obsolete, unused EOL version from 2018, not compatible with current xfce4 packages in repo.
And there are no longer any consumers on AUR. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/xfwm4-gtk2/
