Add TouchBar support to IMK

Number:rdar://39297768 Date Originated:2018/4/10
Status: Resolved:
Product:macOS + SDK, Keyboards, mice and trackpads Product Version:
Classification: Reproducible:
Most Japanese input methods use many function key to convert character type. It is very useful to replace its function with touchbar.

Steps to Reproduce:

Expected Results:
Add API to IMK for touchbar.

Actual Results:
Although there is private API for touchbar, it cannot use from normal input methods. 
It requires app-extension version of inputmethod, but it also is private and undocumented feature.

macOS High Sierra / 10.13.4 (17E199)



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