better mouse stealing behaviour for nuiSlider
better mouse stealing behaviour for nuiSlider

libnui/nui3,libnui/nui3,UIKit0/nui3,UIKit0/nui3,libnui/nui3,UIKit0/nui3,UIKit0/nui3,UIKit0/nui3,libnui/nui3,UIKit0/nui3,libnui/nui3,UIKit0/nui3,libnui/nui3