This is improvement of libinput module fixing a long term issue (since 20.03 I think?). It also allows configuration of mouse and touchpads separately: https://github.com/NixOS/nixpkgs/pull/108909
Simple module fix that should cause nixosTests.moinmoin to pass again. Would like to backport this to 20.09 eventually since it’s broken there too. It’s a python web app.