Merge "Revert "Remove IME surface when occured in multi-window mode"" into...

Merge "Revert "Remove IME surface when occured in multi-window mode"" into rvc-dev am: a840c1f3 am: 80708009

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11838105

Change-Id: If836f5e3b6da092ae09505bd627c65d805080c74