[GtkBackend.SpinButton] Show the widget by default
[GtkBackend.SpinButton] Show the widget by default

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