Merge "Remove keepWindowOpaque and have the window always fade out." into sc-v2-dev am: dff64072ff am: 23fe70386d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16365974

Change-Id: I2b5ee43ad1a173230f6c309c69cb7a3e9daebd41