Add document: TISUnifiedUIForInputMethodEnabling

Number:rdar://39363334 Date Originated:2018/4/12
Status:Open Resolved:
Product:macOS + SDK, Keyboards, mice and trackpads Product Version:
Classification: Reproducible:
Japanese input methods have multiple input mode, traditionally (hiragana, katakana, and more).
Most Japanese don't add/remove each input mode, but all input mode at once.

So it is useful to provide a way to unify muliple input modes for 3rd party Japanese input methods.

Expected Results:
Provide way to unify muliple input modes via InputMethodKit.

Or, add a document about `TISUnifiedUIForInputMethodEnabling`.

Actual Results:
Only Apple's Japanese input method could use `TISUnifiedUIForInputMethodEnabling`.

macOS High Sierra / 10.13.4 (17E199)


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