Set or query the override-redirect flag for the window. When this flag is set, the window is ignored by the window manager: it is not reparented into a decorative frame and the user cannot manipulate it through the usual window manager controls. With no argument, return a boolean indicating whether the flag is set, or None if it has not been set. The flag is reliably honored only when the window is first mapped or remapped from the withdrawn state. wm_overrideredirect() is an alias of overrideredirect().