fixed issue #16: The overlay isn't updated even when the buttons are hidden again
fixed issue #16: The overlay isn't updated even when the buttons are hidden again

kyledecot/MGSwipeTableCell,bob-bolijun/MGSwipeTableCell,ws1227/MGSwipeTableCell,rahul-apple/MGSwipeTableCell,duanhjlt/MGSwipeTableCell,safarijv/MGSwipeTableCell,hanhailong/MGSwipeTableCell,wubangjunjava/MGSwipeTableCell,izrie/MGSwipeTableCell,pengleelove/MGSwipeTableCell,senfi/MGSwipeTableCell,Akylas/MGSwipeTableCell,ucoker/MGSwipeTableCell,MortimerGoro/MGSwipeTableCell,SanChain/MGSwipeTableCell,hulu001/MGSwipeTableCell,postolaki/MGSwipeTableCell,ramoslin02/MGSwipeTableCell,lafosca/MGSwipeTableCell,abhuzz/MGSwipeTableCell,yusuga/MGSwipeTableCell,AlanJN/MGSwipeTableCell,jasontrask/MGSwipeTableCell,mtxs007/MGSwipeTableCell,AlexanderMazaletskiy/MGSwipeTableCell,KBvsMJ/MGSwipeTableCell,BlessNeo/MGSwipeTableCell,emodeqidao/MGSwipeTableCell,lfarah/MGSwipeTableCell,msdgwzhy6/MGSwipeTableCell,jackeychens/MGSwipeTableCell,lovesharyn/MGSwipeTableCellCollectionViewTest,MortimerGoro/MGSwipeTableCell,0359xiaodong/MGSwipeTableCell,hugo-/MGSwipeTableCell,iblueer/MGSwipeTableCell,flovilmart/MGSwipeTableCell,MrZhuGe/MGSwipeTableCell,iDurian/MGSwipeTableCell,zzzworm/MGSwipeTableCell,hanangellove/MGSwipeTableCell,guidomb/MGSwipeTableCell,zilaiyedaren/MGSwipeTableCell,ankorko/MGSwipeTableCell