Merge "Add spacing between items as decorations instead of margins" into sc-dev am: e03784478d am: 84176d5601 am: 37a6723100

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

Change-Id: I35993b225da950ccf66f85d2244c9235621fb09e