Merge "Fixing notification background peeking from the bottom when expanding...

Merge "Fixing notification background peeking from the bottom when expanding QS" into sc-dev am: 4c4ab603 am: 19295e63 am: 5171e388

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14980855

Change-Id: I0a1780840ebb223d9e53c23412510c18e1aefa09