In my experience the kind of corruption shown in comment #3 can only happen with X11 compositors. Because only X11 allows apps to defer responsibility for placing parts of the app (like characters in an editor) to a separate compositor.
So this is probably a bug in compton. Less likely a bug in Xorg. ** Package changed: xorg-server (Ubuntu) => compton (Ubuntu) -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1893969 Title: Characters are rendered with a slight border when using custom xrandr scaling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compton/+bug/1893969/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp

