Merge "Prevent Taskbar from stashing in immersive mode overview." into tm-qpr-dev am: 0355c793c0 am: d3f23005af am: 454fb81f39

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/21560134

Change-Id: I5207a8e62c224a838fa704515d484c976a71f232
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>