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Description of problem:
On serial touchpads (most Lenovos) three-finger taps are often detect as pinch gesture due to the pointer jump the touchpad detects when we go above 2 fingers.

Version-Release number of selected component (if applicable):
libinput 1.6.*

How reproducible:
sudo libinput-debug-events --enable-tap

Then tap with three fingers. That should produce BTN_MIDDLE but you'll find it often detects a fake pointer motion and then switches to a pinch or swipe gesture.

Additional info:
from https://bugzilla.redhat.com/show_bug.cgi?id=1455443

libinput-1.6.3-3.el7 is available in brew

I can confirm that three fingered taps create a BTN_MIDDLE event in libinput-1.8.4-2.el7.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0736