In the process of Xorg cleanup the update requires manual intervention when you hit this message:
:: installing xorgproto (2019.2-2) breaks dependency 'inputproto' required by lib32-libxi
:: installing xorgproto (2019.2-2) breaks dependency 'dmxproto' required by libdmx
:: installing xorgproto (2019.2-2) breaks dependency 'xf86dgaproto' required by libxxf86dga
:: installing xorgproto (2019.2-2) breaks dependency 'xf86miscproto' required by libxxf86misc
when updating, use: pacman -Rdd libdmx libxxf86dga libxxf86misc && pacman -Syu to perform the upgrade.