Screen.getToplevelWindows
gdk.window.Window[] getToplevelWindows()Obtains a list of all toplevel windows known to GDK on the screen screen. A toplevel window is a child of the root window (see [gdk.global.getDefaultRootWindow]).
The returned list should be freed with [glib.list.List.free], but its elements need not be freed.
Returns
list of toplevel windows, free with [glib.list.List.free]