Merge "Maintain TaskView's scroll invariant when swiping down" into sc-dev am: c9744631f4 am: a4d3a9e4f7

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

Change-Id: Iaa291001ec41ed60ef3b4263aa18d72268552686