Merge "Fix IME callback not unregistered when IME is up during an IMM client...

Merge "Fix IME callback not unregistered when IME is up during an IMM client switch." into tm-dev am: 43572500

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18699773



Change-Id: I2039910333ee89fafd17d48c01f85fc0b5ebd4be
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>