Left gravity problem.

[John Coppens <john jcoppens com>]

Hello people.

I've made a small text editor, in which I want to insert markup. I used
the GtkSourceView widget.

If there is a selection, I want to insert tags around the selection,
and I'd like to remain the selection as it was. As I understand, this
means I have to define right_gravity to the left tag, and left_gravity
to the right one. 

This doesn't seem to make any difference... Left works, right tag
always lands inside the selection. To be sure of the order of the tags,
I even call gtk_text_iter_order.

Can someone indicate my problem?
John

  GtkTextIter start, end;
  GtkTextMark *start_mark, *end_mark;
  gboolean empty;
  char *p;
  
  empty = !gtk_text_buffer_get_selection_bounds(GTK_TEXT_BUFFER(src_bff), &start, &end); 
  if (empty) {
    p = g_strdup_printf("%s%s", str1, str2);
    gtk_text_buffer_insert(GTK_TEXT_BUFFER(src_bff), &start, p, -1);
    g_free(p);
  } else {
    gtk_text_iter_order(&start, &end);
    start_mark = gtk_text_buffer_create_mark(GTK_TEXT_BUFFER(src_bff), NULL, &start, FALSE);   
    end_mark   = gtk_text_buffer_create_mark(GTK_TEXT_BUFFER(src_bff), NULL, &end, TRUE); 
    gtk_text_buffer_get_iter_at_mark(GTK_TEXT_BUFFER(src_bff), &start, start_mark);  
    gtk_text_buffer_insert(GTK_TEXT_BUFFER(src_bff), &start, str1, -1);

    gtk_text_buffer_get_iter_at_mark(GTK_TEXT_BUFFER(src_bff), &end, end_mark); 
    gtk_text_buffer_insert(GTK_TEXT_BUFFER(src_bff), &end, str2, -1); }
  }