Merge "Scroll to the selected widget picker row after headers are clicked" into sc-dev am: f15214597e am: f94a93ad2c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14800533

Change-Id: Ia26fadfe1f34d174d74c83bd952881a8ae997c3c