Size negotiation fixes
Size negotiation fixes

When caching the preferred size of a widget, also cache
the constraints that were used to get it. Only return
the cached size if the constraints match the cached ones

Hide scrollbars when the scroll policy is Never

residuum/xwt,mminns/xwt,hamekoz/xwt,TheBrainTech/xwt,mminns/xwt,iainx/xwt,sevoku/xwt,mono/xwt,akrisiun/xwt,steffenWi/xwt,lytico/xwt,directhex/xwt,cra0zy/xwt,antmicro/xwt,hwthomas/xwt