MarsSeed [1] filed a deletion request for kwin-effect-xrdesktop-git [2]: KDE5 only. Broken, unbuildable on current KDE Plasma 6.
Upstream is abandoned for more than a year. [a] [a]: https://gitlab.freedesktop.org/xrdesktop/kwin-effect-xrdesktop [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/kwin-effect-xrdesktop-git/
