I have a tkinter application that has a main window (a Tk) and an additional window (a Toplevel).
I want these windows to group together in the window manager (GNOME Shell). I believe it is necessary to have both the WM_CLASS resource and the WM_CLASS name to be set the same for both windows in order for this to happen.
WM_CLASS(STRING) = "myapp", "Myapp"
WM_CLASS(STRING) = "140626444609872", "Myapp"