GtkFixed widget is created with a separate
GdkWindow for widget->window or not. (By default, it will be
created with no separate GdkWindow). This function must be called
while the GtkFixed is not realized, for instance, immediately after the
window is created.
WARNING: gtk_fixed_set_has_window has been deprecated since version 2.20 and should not be used in newly-written code. Use gtkWidgetSetHasWindow instead.
gtkFixedSetHasWindow(object, has.window)objectGtkFixedhas.windowTRUE if a separate window should be createdGtkFixed to have a separate window.