Add comments about TODO Bug 347083680
There have been known questionable behaviors in InputMethodManagerService#getCurrentInputMethodSubtypeLocked(), where 1) its non-null return value is not guaranteed to belong to the current IME and 2) it can internally update IMMS#mCurrentUserId. While we don't want to introduce any behavior change at this moment, let's leave comments for future readers for now. There must be no side effect in this change. Bug: 347083680 Test: presubmit Flag: EXEMPT refactor Change-Id: I37dbfec0322dbf9d0cad3761b61dc4d07adf23bf
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