https://bugzilla.redhat.com/show_bug.cgi?id=1483629
--- Comment #6 from Peter Hutterer <peter.hutterer(a)redhat.com> ---
fwiw, is's usually easy to figure out what libinput is doing by running 'sudo
libinput debug-events' and then looking at the output.
if I'm reading this correctly, a middle button press + move triggers a zoom,
not an orbit. That's caused by the middle button scroll emulation that is
enabled by default on the trackpoint devices, it converts middle down +
movement to a wheel event equivalent.
under X you can permanently disable this with an xorg.conf snippet that sets
Option "ScrollMethod" "none" for that device. Or with xinput set-prop
"device
name" "libinput Scroll Method Enabled" 0 0 0, but that's not
persistent. I
don't think GNOME has a toggle for that yet.
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