Merge "Scroll to the selected widget picker row after headers are clicked" into sc-dev am: f15214597e am: 9753e04102

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

Change-Id: Ie8566f94997ebec0b2d3188fd6ed50f3b54e226e