Hi, I landed here by suggestion of another user of the OS which I'm using: Manjaro Linux 
Let's start with my system specs:
Since the upgrade of Mesa package to 19.1.1, my graphics (Intel i915) begun to suffer of video tearing: before of such update I never experienced video Tearing, thanks to the compositor (the one shipped by default on XFCE and also if using Compton instead).
To get rid of video tearing I had to enable the <Option "TearFree" "true"> in the /etc/X11/xorg.conf.d/20-intel.conf file.
Furthermore seems that another user of Manjaro, encountered the same issue of Mesa: https://forum.manjaro.org/t/stable-update-2019-07-03-kernels-systemd-pamac-8-0-kde-xfce-browser-qt/93362/143