pango text color in textbuffer

[Ahmed El-Helw <ahmed piousity net>]

hi all -
i am trying to write some code to populate a gtktextbuffer with some  
arabic text.
however, due to the nature of the application i am writing, i need to  
have a certain
word be potentially consistent of different colors [ie the first  
letter is red, the rest of
the word is blue, or the middle two letters are blue and the rest is  
green, etc].

the problem i am having is that the way i am doing it right now  
breaks shaping.
i'd emailed owen about this, and he said that pango should handle  
this, so i am
guessing that i am doing this wrong...

essentially, i am making two identical texttags, with the only  
difference being the
color, and just setting half of the text using one tag and the other  
half the text using
another.

the relevant code is pasted below:
  gtk_text_buffer_get_start_iter(tb, &textIter);
  tag = gtk_text_buffer_create_tag(tb, "black_settings",  
"justification",
        GTK_JUSTIFY_RIGHT, "wrap-mode", GTK_WRAP_WORD, "font",
        "Verdana 24", "foreground", "black", NULL);
  tag2 = gtk_text_buffer_create_tag(tb, "blue_settings",  
"justification",
        GTK_JUSTIFY_RIGHT, "wrap-mode", GTK_WRAP_WORD, "font",
        "Verdana 24", "foreground", "blue", NULL);
  gtk_text_buffer_insert(tb, &textIter, "Correct:\n", strlen 
("Correct:\n"));
  gtk_text_buffer_insert_with_tags(tb, &textIter, str, -1, tag, NULL);

  gtk_text_buffer_insert(tb, &textIter, "\n\nNow:\n", strlen("\n 
\nNow:\n"));
  gtk_text_buffer_insert_with_tags(tb, &textIter, str, 33, tag, NULL);
  gtk_text_buffer_insert_with_tags(tb, &textIter, str+33, -1, tag2,  
NULL);

the output of the program looks very similar to what you can see at  
this screenshot,
which i took from the original gtk# version that i wrote before  
writing the c version.

http://piousity.net/images/arabic_html-04.29.2005.png

if someone can suggest to me a correct way to do this, i'd appreciate  
it.  please also
note that in the c# version, i also tried doing all of this with one  
tag -- ie initialize the
tag, use it to insert the first half the string, then set the  
foreground attribute to something
else, then try to put the second half in -- but that didn't work either.

thanks,
-ahmed