ID 338149 - Node Graph navigation with Wacom pen skips between panning and zooming with varying stylus pressure

Problem summary
When using a Wacom graphics tablet and pen to navigate the Node Graph and pressing MMB to zoom, Katana's behaviour can be erratic and skip between panning and zooming.

This does not seem to happen when the Wacom pen is set to hover mode (when pressing a button on the pen that is mapped to a mouse button, the click event is triggered while the pen is hovering over the tablet), but only when the pen has to be tapped on the tablet to trigger the click event. In this case the pressure of the pen seems to have an influence, as the panning is correct with very light pressure, but with higher pressure the Node Graph tab is zoomed instead.

Steps to reproduce

1) Set up a Wacom tablet and in the configuration, make sure the pen is set to tap to execute the actions mapped to the buttons.
On Windows this option may be found under Options > Click & Tap or as a checkbox to Tap to execute action.
On Linux, first find the ID of the Wacom stylus using the following command:
xsetwacom list Then activate tap-to-execute using the following command:
xsetwacom set <id> TabletPCButton on