can-do-edit-operation? (augmentable only) in snip%

See can-do-edit-operation?.

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

• (send a-snip can-do-edit-operation? op recursive?) -> boolean
     op : symbol in '(undo redo clear cut copy paste kill select-all insert-text-box insert-pasteboard-box insert-image)
   recursive? = #t : boolean

  See can-do-edit-operation? for information about the arguments.