Add clipping for Gtk2 context
Add clipping for Gtk2 context

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