Properly update the style cascade on screen change
Properly update the style cascade on screen change

GtkStyleContext was not properly handling the style cascade when
setting a screen, causing the inspector global CSS to affect the
inspector window, even though the inspector is using a different
screen now.

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