Fix closing a window
Fix closing a window

Skarm/walk,JSchwehn/walk,hawkchch/walk,jtwatson/win,dayed/walk,henrylee2cn/walk,antonlahti/go-winapi,tajtiattila/walk,jtwatson/walk,Skarm/walk,CodyGuo/walk,ssoor/winapi,CodyGuo/win