oech3 [1] filed a request to merge mount-gtk2-git [2] into mount-gtk [3]: Terget to merge should be -git. But no reason to keep GTK2 version.
[1] https://aur.archlinux.org/account/oech3/ [2] https://aur.archlinux.org/pkgbase/mount-gtk2-git/ [3] https://aur.archlinux.org/pkgbase/mount-gtk/