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

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

Change-Id: Id5cc186977217a4da3f3744b2d7c92385b00c9d4