If
the widget is realized and managed and if the new value of map_when_managed
is True, XtSetMappedWhenManaged maps the window. If the widget is realized
and managed and if the new value of map_when_managed is False, it unmaps
the window. XtSetMappedWhenManaged is a convenience function that is equivalent
to (but slightly faster than) calling XtSetValues and setting the new
value for the mappedWhenManaged resource. As an alternative to using XtSetMappedWhenManaged
to control mapping, a client may set mapped_when_managed to False and
use XtMapWidget and XtUnmapWidget explicitly.