needs-update

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`needs-update`

Called by the snip to request that the snip's display needs to be updated. The administrator determines when to actually update the snip; the snip's drawmethod is eventually called.

(send a-wx:snip-admin needs-update snip localx localy w h) -> void
    snip : wx:snip% object
    localx : inexact real
    localy : inexact real
    w : inexact real
    h : inexact real
The localx, localy, w, and h arguments specify a region of the snip to be refreshed (in snip coordinates).

PLT