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: a447125c

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

Change-Id: I926a8bd2cdf95d96e33d715dba4991852db70ba0