question: private void clampPositionToBottomStackStart ( StackScrollState . ViewState childViewState , int childHeight ) { childViewState . yTranslation = Math . min ( childViewState . yTranslation , mInnerHeight - mBottomStackPeekSize - mCollapseSecondCardPadding - childHeight ) ; }
target:  Clamp the yTranslation of the child down such that its end is at most on the beginning of the bottom stack.