Steam overlay unresponsive on Linux

[peterprototypes]

The steam overlay on linux doesn't receive mouse motion and mouse button events.

It appears the folks at glfw had the same problem and it's due to XInput2 event masking.

Commenting out a few lines from the mask seems to fix it, but I'm not sure what else will that break and where. Even when they are missing from the event mask the window continues to receive mouse motion and button events and they appear in the output.

Short clip demonstrating the problem

EDIT:
No, commenting out those lines actually breaks mouse input.