'Creates a return a simple vertical box containing all the widgets
that make the sidebar.'

def get_box(self):

    box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
    box.pack_start(self.search_entry, False, False, 0)
    box.pack_start(self.workspace_view, True, True, 0)
    box.pack_start(self.sidebar_button, False, False, 0)
    return box
