Combine successive TeX super- and subscript elements. * libinterp/corefcn/oct-tex-parser.yy (combined_script_element): New rule. Add %nonassoc statements to control precedence and resolve shoft/reduce conflicts. * libinterp/corefcn/txt-eng.h (class text_element_combined): New class. (text_processor::visit(text_element_combined)): New method. * libinterp/corefcn/txt-eng-ft.h (ft_render::visit(text_element_combined)): Likewise. * libinterp/corefcn/txt-eng-ft.cc (ft_render::push_new_line): Reset xoffset/yoffset in MODE_BBOX mode. (ft_render::process_character): Use xoffset as the current X advancement and update the line bbox accordingly. (ft_render::visit(text_element_combined)): New method.

--- a/libinterp/corefcn/txt-eng-ft.h	Sun Aug 18 18:19:48 2013 -0400
+++ b/libinterp/corefcn/txt-eng-ft.h	Sun Aug 18 21:39:27 2013 -0400
@@ -75,6 +75,8 @@
 
   void visit (text_element_symbol& e);
 
+  void visit (text_element_combined& e);
+
   void reset (void);
 
   uint8NDArray get_pixels (void) const { return pixels; }