places sidebar: Use a popover for the context menu
places sidebar: Use a popover for the context menu

Use a popover for the context menu, and add a long press gesture
to allow opening it with touch.

davidgumberg/gtk,jigpu/gtk,grubersjoe/adwaita,jigpu/gtk,jadahl/gtk,chergert/gtk,Adamovskiy/gtk,grubersjoe/adwaita,davidgumberg/gtk,jadahl/gtk,davidgumberg/gtk,davidgumberg/gtk,chergert/gtk,grubersjoe/adwaita,Adamovskiy/gtk,chergert/gtk,grubersjoe/adwaita,grubersjoe/adwaita,jadahl/gtk,jigpu/gtk,jigpu/gtk,alexlarsson/gtk,alexlarsson/gtk,grubersjoe/adwaita,chergert/gtk,davidgumberg/gtk,jigpu/gtk,alexlarsson/gtk,grubersjoe/adwaita,jigpu/gtk,alexlarsson/gtk,davidgumberg/gtk,chergert/gtk,jadahl/gtk,alexlarsson/gtk,chergert/gtk,jigpu/gtk,Adamovskiy/gtk,jadahl/gtk,Adamovskiy/gtk,chergert/gtk,alexlarsson/gtk,davidgumberg/gtk,jadahl/gtk,Adamovskiy/gtk,Adamovskiy/gtk,davidgumberg/gtk,alexlarsson/gtk,chergert/gtk,Adamovskiy/gtk,alexlarsson/gtk,grubersjoe/adwaita,jigpu/gtk,Adamovskiy/gtk,jadahl/gtk,jadahl/gtk