Merge "Show divider when GroupedTaskView expanded from recents" into sc-v2-dev am: 160b1357bf am: 74cc6bfd12

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16199625

Change-Id: Ie49158f4d2da863c734618953621403c52a35600