Merge "Folder preview polish." into sc-dev am: 65c20f4a91 am: 6247cf8a68 am: 06fc7bc1f7

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14912724

Change-Id: Ibff1db24cd4e9199b5e8a449302ecf1eb8a14757