x/exp/shiny: X11's Compose key not supported

[aarzilli]

I have submitted a patch in https://go-review.googlesource.com/#/c/24880/ and https://go-review.googlesource.com/#/c/24881/ (it straddles two repositories, I'm not sure what the correct way to propose this change is).

[gopherbot]

CL https://golang.org/cl/24881 mentions this issue.

[hyangah]

@nigeltao Can you please take a look? I briefly checked USB HID code table but couldn't find the matching code.