Merge "Preventing workspace scroll over QSB area" into sc-v2-dev am: cb776ca518 am: a30438a13f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15694303

Change-Id: Ic99fb72e9ecb64a2403414b68cfec73153342b4f