wn_fixcsr -- update window cursor position

        USAGE

          wn_fixcsr(wn)
          WINDOWPTR wn;

                wn - window handle

          wn_fixcsr is a companion routine to wn_sync.  Causes the
          physical cursor to be placed at the logical cursor location.
          It is typically called after wn_sync has been called to disable
          cursor synchronization.  wn_fixcsr does not alter the state of
          the windows cursor synchronization flag.

        RETURNS

          TRUE or NULL if error

        CAUTIONS

          The window "wn" automatically becomes the top window tile upon
          return.