More comments on row item spacing calculation
More comments on row item spacing calculation

CorzFree/PSTCollectionView,thevuuranusls/PSTCollectionView,zace-yuan/PSTCollectionView,godLoveLucifer/PSTCollectionView,Anish-kumar-dev/PSTCollectionView,Kevin775263419/PSTCollectionView,niuxinghua/PSTCollectionView,zjh171/PSTCollectionView,Amnysia/PSTCollectionView,jianwoo/PSTCollectionView,StephaneDelcroix/PSTCollectionView,steipete/PSTCollectionView,StephaneDelcroix/PSTCollectionView,ba01ei/PSTImprovedCollectionView