Merge "Scroll to the selected widget picker row after headers are clicked" into sc-dev am: f15214597e am: f94a93ad2c am: aff0c431c1

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

Change-Id: If8f9556c89e06e7fdc05210c6b1d6e1ae2a165cb