Merge "Explicitly set mAllowGoingDown = false when only up is allowed" into sc-dev am: 2b93dbb0b8 am: 6b5c7da9d5

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14444776

Change-Id: I55f920a7c5959cf6030f92333dd76280c5b9c1af