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: I0bb0d1bd2994e562a8d07da030306b3b63a4791b