Merge "Fix RecyclerViewFastScroller bugs, hide keyboard" into sc-dev am: 6e673c7ed8 am: 40344e2d7b

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14931940

Change-Id: I77ce13b8fa5687b83056b4583b9fdb36aa6b37ca