Merge "Fix cast exception when dropping widgets to a drop target" into sc-dev am: 2e17bbae0d am: 81aa250ff9

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14281909

Change-Id: Ida21eb840b9541923397a10f82cb361a03b7d458