A simple (but partial) solution is to move the [antergos] section in /etc/pacman.conf to the end of that file. Then upstream packages have precedence. However that doesn’t help with the AUR packages.
For me it works well on Xfce, I’ve had that for about a month now. But there may be glitches for others and non-Xfce desktops, so be careful if you change the order.
If I move [antergos] section as the first in /etc/pacman.conf, then this is the (relevant) output of command pacman -Syyuu:
warning: atril: downgrading from version 1.20.3-2 to version 1.20.3-1
warning: lightdm-webkit2-greeter: downgrading from version 2.2.5-2 to version 2.2.5-1
warning: mate-icon-theme: downgrading from version 1.20.3-1 to version 1.20.2-1
warning: xed: downgrading from version 2.0.2-1 to version 1.6.3-1
warning: yad: downgrading from version 0.42.0-0 to version 0.39.0-1
warning: yay: downgrading from version 9.1.0-0 to version 8.1173.0-11
The issue could be solved by creating a “fixer” repo that contains up-to-date versions of these packages… But it is extra work, and is easier to fix by updating the Antergos repo. Are there any technical or other reason why we couldn’t fix the Antergos github packages?