Merge "Make sure tasks not in split root is invisible while in split" into...

Merge "Make sure tasks not in split root is invisible while in split" into sc-dev am: 34f49d6c am: 5a49af5a am: a714710f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14440881

Change-Id: Iee9e5191f90cdedb99c01ee8a7b2c706ea2bd156