Merge "Invalidate (re-section) the list when a notification is no longer heads...

Merge "Invalidate (re-section) the list when a notification is no longer heads up." into tm-qpr-dev am: c8adfe87

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18353052



Change-Id: I5cb38e59b89fb25cb99db56cde71647359fbe34d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>