Merge "overview: rebalance hidden tasks in grid" into sc-v2-dev am: 242c8c0b0f am: 65dc11d1b4

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15453918

Change-Id: I0cbcf90477d70eef2bfd1680428c4997860488f1