ui.gadgets.worlds: use constraints for single gadget in window.
ui.gadgets.worlds: use constraints for single gadget in window.

tgunr/factor,mrjbq7/factor,factor/factor,tgunr/factor,tgunr/factor,AlexIljin/factor,factor/factor,AlexIljin/factor,tgunr/factor,AlexIljin/factor,AlexIljin/factor,bpollack/factor,bpollack/factor,mrjbq7/factor,mrjbq7/factor,AlexIljin/factor,factor/factor,factor/factor,bpollack/factor,mrjbq7/factor,mrjbq7/factor,bpollack/factor,bpollack/factor,AlexIljin/factor,AlexIljin/factor,bpollack/factor,bpollack/factor,tgunr/factor,mrjbq7/factor,factor/factor,factor/factor,tgunr/factor