Inserts text into buffer at iter, applying the list of tags to
the newly-inserted text. The last tag specified must be NULL to
terminate the list. Equivalent to calling gtk_text_buffer_insert(),
then gtk_text_buffer_apply_tag() on the inserted text;
gtk_text_buffer_insert_with_tags() is just a convenience function.
Inserts text into buffer at iter, applying the list of tags to the newly-inserted text. The last tag specified must be NULL to terminate the list. Equivalent to calling gtk_text_buffer_insert(), then gtk_text_buffer_apply_tag() on the inserted text; gtk_text_buffer_insert_with_tags() is just a convenience function.