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

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

Change-Id: I5bec96c3038121247bed12a6f8bdf8f32ca46e2e