widget-factory: Adapt to label clipping change
widget-factory: Adapt to label clipping change

The paned examples on page 2 were implicitly relying on labels
drawing unclipped. Instead of setting the view class only on the
labels, set it on the paned's instead.

Lyude/gtk-,jigpu/gtk,Lyude/gtk-,Adamovskiy/gtk,jigpu/gtk,alexlarsson/gtk,jigpu/gtk,chergert/gtk,ahodesuka/gtk,chergert/gtk,jadahl/gtk,Adamovskiy/gtk,alexlarsson/gtk,jessevdk/gtk,jadahl/gtk,grubersjoe/adwaita,alexlarsson/gtk,chergert/gtk,grubersjoe/adwaita,jessevdk/gtk,chergert/gtk,Adamovskiy/gtk,Adamovskiy/gtk,grubersjoe/adwaita,davidgumberg/gtk,Lyude/gtk-,ahodesuka/gtk,alexlarsson/gtk,jadahl/gtk,jigpu/gtk,grubersjoe/adwaita,alexlarsson/gtk,davidgumberg/gtk,jadahl/gtk,Lyude/gtk-,Adamovskiy/gtk,grubersjoe/adwaita,chergert/gtk,jessevdk/gtk,jessevdk/gtk,ahodesuka/gtk,jadahl/gtk,ahodesuka/gtk,Adamovskiy/gtk,grubersjoe/adwaita,ahodesuka/gtk,alexlarsson/gtk,jessevdk/gtk,alexlarsson/gtk,ahodesuka/gtk,Lyude/gtk-,davidgumberg/gtk,jessevdk/gtk,ahodesuka/gtk,davidgumberg/gtk,jigpu/gtk,Adamovskiy/gtk,Lyude/gtk-,alexlarsson/gtk,davidgumberg/gtk,ahodesuka/gtk,davidgumberg/gtk,jessevdk/gtk,Adamovskiy/gtk,jigpu/gtk,jadahl/gtk,chergert/gtk,davidgumberg/gtk,davidgumberg/gtk,jadahl/gtk,grubersjoe/adwaita,jadahl/gtk,Lyude/gtk-,jigpu/gtk,Lyude/gtk-,grubersjoe/adwaita,jigpu/gtk,chergert/gtk,chergert/gtk