Merge "Add spacing between items as decorations instead of margins" into sc-dev am: e03784478d am: f792c64c6a am: dbfded01db

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15028527

Change-Id: I796fee16073dfd2f1a6054fa117b4810579cbd2a