Merge "Fix issue #13366. Take account of stackFromBottom in computeVerticalScrollOffset()."

            int height = view.getHeight();

            if (height > 0) {

                final int numColumns = mNumColumns;

                final int whichRow = mFirstPosition / numColumns;

                final int rowCount = (mItemCount + numColumns - 1) / numColumns;

                // In case of stackFromBottom the calculation of whichRow needs

                // to take into account that counting from the top the first row

                // might not be entirely filled.

                final int oddItemsOnFirstRow = isStackFromBottom() ? ((rowCount * numColumns) -

                        mItemCount) : 0;

                final int whichRow = (mFirstPosition + oddItemsOnFirstRow) / numColumns;

                return Math.max(whichRow * 100 - (top * 100) / height +

                        (int) ((float) mScrollY / getHeight() * rowCount * 100), 0);

            }