handle orphans case

[liajoy]

Hi!
I have no idea why nextToLastRowHeight use height here.
In some case, it'll make box out of container.
Here is the options
{ sizes: [ { width: 2000, height: 1500, }, { width: 500, height: 332, } ], config: { targetRowHeightTolerance: 0, containerPadding: 0, boxSpacing: 8, containerWidth: 280, targetRowHeight: 140, } }