+ MathGridInset * enclosingGrid(idx_type & idx) const;
+ /// return the next enclosing hull inset and the cursor's index in it
+ MathHullInset * enclosingHull(idx_type & idx) const;
+ /// go up to enclosing grid
+ void popToEnclosingGrid();
+ /// go up to the hull inset
+ void popToEnclosingHull();
+ ///
+ InsetFormulaBase * formula() const;