use gtk.ScrollWindow to fix ScrollWindow's bug in DUI

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/7755e44dada9493abe98b7da86f714f0/

Change-Id: I0a8548699b58c2dcc9666c34c382bfdbc13d16b6