Merge "Scroll to the selected widget picker row after headers are clicked" into sc-dev am: f15214597e am: 42dbf75cfa

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

Change-Id: I49f9ed55511b5af9b2a96ee031e49033ddf6580a