hide combo popup scrolling on main window

Change-Id: Idf30d7b221e89ad0811336f31a9a145be5343131
tower: https://tower.im/projects/d4e0ff64158645f28d99a9ca72d0c27b/todos/0b06f10ed67f4486b55bb6efee965e9d/
Merge "hide combo popup scrolling on main window"