gestures: Add a test for grouping
gestures: Add a test for grouping

I'm not entirely convinced the test produces the expected
outcome, here.

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