Fixing GtkScrolledWindow inconsistent scrollbar visibility.
Fixing GtkScrolledWindow inconsistent scrollbar visibility.

Also removing the hack to prevent hangs which is properly fixed by
the preceeding commit.

davidt/gtk,grubersjoe/adwaita,simokivimaki/gtk,Adamovskiy/gtk,Adamovskiy/gtk,ebassi/gtk,bratsche/gtk-,davidt/gtk,Sidnioulz/SandboxGtk,bratsche/gtk-,ahodesuka/gtk,grubersjoe/adwaita,simokivimaki/gtk,grubersjoe/adwaita,Adamovskiy/gtk,alexlarsson/gtk,Lyude/gtk-,jessevdk/gtk,Sidnioulz/SandboxGtk,Adamovskiy/gtk,jigpu/gtk,jigpu/gtk,ahodesuka/gtk,jigpu/gtk,davidt/gtk,Lyude/gtk-,jadahl/gtk,chergert/gtk,ebassi/gtk,simokivimaki/gtk,davidt/gtk,jessevdk/gtk,bratsche/gtk-,alexlarsson/gtk,Lyude/gtk-,msteinert/gtk,msteinert/gtk,davidgumberg/gtk,jessevdk/gtk,Distrotech/gtk2,chergert/gtk,alexlarsson/gtk,Distrotech/gtk2,davidt/gtk,alexlarsson/gtk,Lyude/gtk-,jigpu/gtk,ebassi/gtk,chergert/gtk,alexlarsson/gtk,jadahl/gtk,Adamovskiy/gtk,jigpu/gtk,simokivimaki/gtk,msteinert/gtk,davidgumberg/gtk,ahodesuka/gtk,Adamovskiy/gtk,bratsche/gtk-,simokivimaki/gtk,msteinert/gtk,Distrotech/gtk2,jessevdk/gtk,davidgumberg/gtk,ebassi/gtk,alexlarsson/gtk,ahodesuka/gtk,bratsche/gtk-,Sidnioulz/SandboxGtk,jadahl/gtk,ebassi/gtk,msteinert/gtk,jadahl/gtk,davidgumberg/gtk,Lyude/gtk-,davidgumberg/gtk,bratsche/gtk-,Lyude/gtk-,ebassi/gtk,Sidnioulz/SandboxGtk,ahodesuka/gtk,jadahl/gtk,jadahl/gtk,davidgumberg/gtk,jadahl/gtk,jigpu/gtk,Distrotech/gtk2,Lyude/gtk-,ahodesuka/gtk,Adamovskiy/gtk,Distrotech/gtk2,chergert/gtk,chergert/gtk,Sidnioulz/SandboxGtk,Lyude/gtk-,grubersjoe/adwaita,Adamovskiy/gtk,davidgumberg/gtk,jadahl/gtk,alexlarsson/gtk,grubersjoe/adwaita,chergert/gtk,grubersjoe/adwaita,simokivimaki/gtk,Sidnioulz/SandboxGtk,ahodesuka/gtk,jessevdk/gtk,jessevdk/gtk,davidgumberg/gtk,jigpu/gtk,grubersjoe/adwaita,grubersjoe/adwaita,Distrotech/gtk2,alexlarsson/gtk,davidt/gtk,msteinert/gtk,chergert/gtk,ahodesuka/gtk,jigpu/gtk,chergert/gtk,jessevdk/gtk