Merge "Setting to control seen notification filtering" into tm-qpr-dev am: c8a6db40

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/21022067



Change-Id: Ibb65634f4c0f6b45dc8a769d4a45c363c4c63522
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>