PanelMenu.Button sets up a `this.actor = this` property for compatibility, but let's reflect the actual new object hierarchy. https://gitlab.gnome.org/GNOME/gnome-shell-extensions/issues/113
PanelMenu.Button sets up a `this.actor = this` property for compatibility, but let's reflect the actual new object hierarchy. https://gitlab.gnome.org/GNOME/gnome-shell-extensions/issues/113