Bound overscroll shift amount to avoid content from drawing on top (Y-val)

of the QSB.

Bug: 77538324
Change-Id: Idabc4365c5fe5cb1894fa0eb84ea9309b85f99a3

src/com/android/launcher3/views/SpringRelativeLayout.java

@@ -97,7 +97,7 @@ public class SpringRelativeLayout extends RelativeLayout {
         mActiveEdge = edge;
     }
 
-    private void setDampedScrollShift(float shift) {
+    protected void setDampedScrollShift(float shift) {
         if (shift != mDampedScrollShift) {
             mDampedScrollShift = shift;
             invalidate();