Merge "Show divider when GroupedTaskView expanded from recents" into sc-v2-dev am: 160b1357bf am: 82a7d3424d

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

Change-Id: I8412d174bc95878c6a00bb75849d39a4dc0f5f58