do-edit-operation

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`do-edit-operation`

Called when the snip's editor's method is called, recusive? is not #f, and this snip owns the caret.

(send a-snip do-edit-operation op recursive? time) -> void
    op : symbol in '(undo redo clear cut copy paste kill select-all insert-text-box insert-pasteboard-box insert-image)
    recursive? = #t : boolean
    time = 0 : exact integer
See do-edit-operation in editor<%> for information about op and time.