Update: additional evidence on 7.0.0-42.

On 7.0.0-42 the HID report of this clickpad is split across two input nodes
(libinput pointer + synaptics pointer). Measured with different X button maps:

- map "3 3 1" on both nodes: left zone -> right click, right zone -> left click
- identity map on the libinput node, "3 3 1" on the synaptics node:
  left zone -> no event at all, right zone -> left click

So no single device receives the complete button set: the left zone is only
reachable through one node and the right zone only through the other. No X
button-map can fix both at once, which rules out a mapping/configuration error
and points at how hid-multitouch/i2c-hid splits this device's button
collections on 7.0.0-42.

Workaround in use: stay on 7.0.0-38 (42 removed and apt-pinned), with a button
map that corrects the pre-existing swap of the two click zones.

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https://bugs.launchpad.net/bugs/2172392

Title:
  Regresión en 7.0.0-42: el clickpad i2c-hid SYNA3602 (VAIO
  VJFE52A1811H) deja de entregar el clic físico izquierdo y enumera 4
  nodos input «UNKNOWN»

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