bader [1] filed a deletion request for i3-gaps-doubleborder [2]: This package looks abounded and this git branch is getting deprecated.

i3-gaps Project status

The i3-gaps project has been merged with i3. All i3-gaps features will become available > with i3 4.22 (not released yet at the time of writing this).

Package maintainers are asked to replace any i3-gaps packages with the i3 package once i3 4.22 has been released. This repository will be archived and no longer be kept up to date.

source: https://github.com/Airblader/i3/tree/gaps-next [1] https://aur.archlinux.org/account/bader/ [2] https://aur.archlinux.org/pkgbase/i3-gaps-doubleborder/