I found a bug (or probably: unimplemented behaviour) in how the touchpad operates in GNOME 3. I'd like to report it in the appropriate channels (or at least check if it's already reported), but I have no idea with software is responsible for its behaviour. Who knows?
Note that I do not want to report an Ubuntu-specific bug, as described in How do I report a bug?, and the Wiki page How do I find the right package? also does not describe which package is appropriate for the touchpad handling.
ubuntu-bug gnome-shell
is the best place to start there. – dobey Aug 05 '18 at 12:10