Edited Unassigned: Copy worksheet and insert new row [15337]

When I copy a worksheet and insert a new row, the generated file is damaged. My solution is to use

```
added._sharedFormulas.Add(key, (Copy._sharedFormulas[key]).Clone(added.Name));
```

in _CloneCells_ function

and using

```
public Formulas Clone(string worksheet)
{
Formulas newF = this.MemberwiseClone() as Formulas;
newF._tokenizer = SourceCodeTokenizer.Default;
newF.Tokens = newF._tokenizer.Tokenize(newF.Formula, worksheet);
return newF;
}
```

inf _Formulas_ class