XmTextEnableRedisplay is used in conjunction with
XmTextDisableRedisplay, which suppresses visual update
of the Text widget. When XmTextEnableRedisplay is
called, it determines if any visual attributes have been set
or modified for the specified widget since XmTextDisableRedisplay
was called. If so, it forces the widget to update its visual display for
all of the intervening changes. Any subsequent changes that affect
visual appearance cause the widget to update its visual display.