NAME
        RethinkDisplay -- Grand manipulation of the entire Intuition display.

    SYNOPSIS
        failure = RethinkDisplay()
        D0 (V39)

        long rethinkdisplay( void );
        /* Returns long in v39 and greater */

    FUNCTION
        This function performs the Intuition global display reconstruction.
        This includes rethinking about all of the  ViewPorts and their
        relationship to one another and reconstructing the entire display
        based on the results of this rethinking.

        Specifically, and omitting many internal details, the operation
        consists of this:

            Determine which ViewPorts are invisible and set their VP_HIDE
            viewport mode flag. vp_hide flags are also set for screens that
            may not be simultaneously displayed with the frontmost (V36).

            If a change to a viewport height, or changing interlace or
            monitor scan rates require, makevport() is called for specific
            screen viewports.  After this phase, the intermediate Copper lists
            for each screen's viewport are correctly set up.

            mrgcop() and loadview() are then called to get these copper lists
            in action, thus establishing the new state of the Intuition
            display.

        You may perform a makescreen() on your custom screen before calling
        this routine.  The results will be incorporated in the new display, but
        changing the INTERLACE viewport mode for one screens must be reflected
        in the Intuition view, which is left to intuition.

        WARNING:  This routine can take several milliseconds to run, so
        do not use it lightly.

        New for V36: This routine is substantially changed to support
        new screen modes.  In particular, if screen rearrangement has
        caused a change in interlace mode or scan rate, this routine
        will remake the copper lists for each screen's viewport.

    INPUTS
        None

    RESULT
        Starting with V39, returns zero for success, non-zero for failure.
        Probable cause of failure is failure of graphics.library/makevport()
        or of graphics.library/mrgcop().
        Prior to V39, the return code is invalid.  Do not interpret it when
        running on pre-V39 systems!

    BUGS
        In V35 and earlier, an interlaced screen coming to the front
        may not trigger a complete remake as required when the global
        interlace state is changed.  In some cases, this can be compensated
        for by setting the viewport DHeight field to 0 for hidden screens.

    SEE ALSO
        remakedisplay(), graphics.library/makevport(), graphics.library/mrgcop(),
        graphics.library/loadview(), makescreen()