gtk_text_buffer_insert_at_cursor in "insert-text"

["Michael Matthews" <michael-a-matthews lycos com>]

Hi!

I am trying to insert tab characters into a GtkTextView using gtk_text_buffer_insert_at_cursor from within 
the "insert-text" signal handler so that my text editor can support automatic indentation.
                                
  gtk_text_buffer_insert_at_cursor (
    instance ()._data,
    instance ()._indentation,
    g_utf8_strlen (instance ()._indentation, -1)
  );

However, I keep getting strange warnings about the iterator position being invalid. These warnings appear to 
occur within the GTK runtime after my signal handler has returned. I have tried copying the cursor iterator 
and calling gtk_text_buffer_insert, but the warnings persist. Am I not supposed to modify the text buffer's 
contents from within "insert-text" handlers? If not, how should I implement automatic indentation?

 - Michael Matthews

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