Added scrollbars to the Listbox GtkTreeViews.
Added scrollbars to the Listbox GtkTreeViews.

hajimehoshi/ui,hajimehoshi/ui,UIKit0/ui,ProtonMail/ui,292388900/ui,beni55/ui,HunterChen/ui,robbiev/ui,cainiaocome/ui,mirrr/ui,cainiaocome/ui,janstk/ui,292388900/ui,UIKit0/ui,mirrr/ui,janstk/ui,robbiev/ui,mirrr/ui,ProtonMail/ui,cainiaocome/ui,robbiev/ui,292388900/ui,UIKit0/ui,ProtonMail/ui,beni55/ui,hajimehoshi/ui,HunterChen/ui,janstk/ui,HunterChen/ui,beni55/ui