I had the same symptoms. Try the changes to the code I made in pull request 95. It uses a newer Linux API to register the device, and libinput seems happy with it now, so it works in gimp and inkscape.
Possibility of passing mouse events through?
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I’ve found that GfxTablet also works great for using a Bluetooth mouse on a computer without Bluetooth. Mouse movement is passed through as I would expect. Scrolling doesn’t work and middle click/right click all register as left click. Would it be possible to have GfxTablet also pass those actions to the computer?