Merge "Only show collapse handle when the bottom widgets picker is scrollable" into sc-dev am: 1b28e6d40a am: ddada389f7 am: b16b9f2971

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14453618

Change-Id: I93929d6e5eb77cf4af410c66907d715f8cf90fd9