Merge "Revert "Revert "Remove IME surface when occured in multi-window mode""" into rvc-dev am: 8ec4d3a33f am: b589824526 am: 1be0abe801

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11862408

Change-Id: Ib8c3a7c61dccc783b858b18402dc6248e0aedb2b