NAME
    NewModifyProp -- modifyprop(), but with selective refresh.

SYNOPSIS
    NewModifyProp( gadget, window, requester, flags,
                   A0      A1      A2         D0
            HorizPot, VertPot, HorizBody, VertBody, NumGad )
            D1        D2       D3         D4        D5

    VOID NewModifyProp( struct gadget *, struct window *,
            struct requester *, uword, uword, uword, uword, uword, word );

FUNCTION
    Performs the function of modifyprop(), but refreshes
    gadgets in the list as specified by the NumGad parameter.
    With NumGad = -1, this function is identical to modifyprop().

    New for V36: When NumGad = 1, this function will now perform
    an incremental update of the proportional gadget knob image,
    rather than refreshing the entire gadget.  This means much
    less flashing when programmatically scrolling a proportional
    gadget.

INPUTS
    PropGadget = pointer to a proportional gadget
    window = pointer to the window containing the gadget or the window
        containing the requester containing the gadget.
    requester = pointer to a requester (may be null if this isn't
        a requester gadget)
    Flags = value to be stored in the Flags field of the propinfo
    HorizPot = value to be stored in the HorizPot field of the propinfo
    VertPot = value to be stored in the VertPot field of the propinfo
    HorizBody = value to be stored in the HorizBody field of the propinfo
    VertBody = value to be stored in the VertBody field of the propinfo
    NumGad = number of gadgets to be refreshed after propgadget internals
        have been adjusted.  -1 means "to end of list."

RESULT
    None

BUGS

SEE ALSO
    modifyprop()
    The Intuition Reference Manual contains more information on
    Proportional Gadgets.