Merge "Revert "Remove IME surface when occured in multi-window mode"" into rvc-dev am: a840c1f3 am: a447125c am: 09488c36 am: 68fdb2b1

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

Change-Id: I01d7f6d0136f3a4e74a6b49bc4a7a5e76255ef72