void gtk_window_set_application ( GtkWindow* window, GtkApplication* application )
Sets or unsets the
GtkApplication associated with the window.
The application will be kept alive for at least as long as it has
any windows associated with it (see
g_application_hold() for a way
to keep it alive without windows).
Normally, the connection between the application and the window will
remain until the window is destroyed, but you can explicitly remove
it by setting the
The argument can be
The data is owned by the caller of the function.