+ /// is between pos-1 and pos an RTL<->LTR boundary?
+ bool isRTLBoundary(Buffer const & buffer, Paragraph const & par,
+ pos_type pos) const;
+ /// would be a RTL<->LTR boundary between pos and the given font?
+ bool isRTLBoundary(Buffer const & buffer, Paragraph const & par,
+ pos_type pos, Font const & font) const;
+