Returns whether the operation can be redone in its current state.
Note: The computation for this method must be fast, as it is called frequently. If necessary, this method can be optimistic in its computation (returning true) and later perform more time-consuming computations during the actual redo of the operation, returning the appropriate status if the operation cannot actually be redone at that time.
@returntrue if the operation can be redone;false otherwise.
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