[GTK] ProgressBar: dispose Timer properly
[GTK] ProgressBar: dispose Timer properly
cra0zy/xwt,mono/xwt,TheBrainTech/xwt,antmicro/xwt,lytico/xwt,mminns/xwt,mminns/xwt,sevoku/xwt,hamekoz/xwt,residuum/xwt,directhex/xwt,akrisiun/xwt,steffenWi/xwt,iainx/xwt,hwthomas/xwt