ID 366851 - Mari 4.2v1 doesn't respect Wacom pen mapping from the Wacom Tablet Preferences when navigating the Viewport

Problem summary
Mari 4.2v1 doesn't respect Wacom pen mapping from the Wacom Tablet Preferences when navigating the Viewport.

For example, if you set all the buttons to be left click, Mari will still use the Mari default mapping for moving around the Viewport, when all it should be doing is orbiting.

Additionally, if you try mapping the buttons inside Mari using the Edit>Shortcuts menu. When you try to map any pen button, no matter what the Wacom settings are, the input always gets detected as Left Click. 

Customer reported version

Mari 4.2v1

Customer reported platform

Windows 10

Steps to reproduce

1) Open Wacom Tablet Preferences

2) Set the pen mapping for all buttons to be Click:

4) Open any project 

5) Navigate around the viewport using Alt+Pen buttons, Mari always uses the lower button for Zooming and the upper button for Panning.

Workaround
Unknown.

Reproduced by support
This bug has been reproduced in:

Mari 4.2v1 - Windows 10 - regression

Unable to reproduce bug in:
Mari 4.2v1 - CentOS 6.9

Mari 4.1v2 - Windows 10, CentOS 6.9

Earliest version tested
Mari 4.1v2 - This issue no longer appears in this version and has regressed
 

Expected behaviour
For Mari use the button mapping defined in the Wacom Tablet Preferences

Actual behaviour
Mari always used the lower button for Zooming and the upper button for Panning.