Merge "Maintain TaskView's scroll invariant when swiping down" into sc-dev am: c9744631f4

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14425536

Change-Id: I1c1f57e02aa53708c2abb1a46c58b3f4d0e43cac