Merge "Fix RecyclerViewFastScroller bugs, hide keyboard" into sc-dev am: 6e673c7ed8 am: 40344e2d7b am: f01dd5128b

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

Change-Id: I75750c2251835e131f4277066d072b68136f2d00