title: adding toolbarItem to GtkToolbar to specific position on toolbar crashes
body: <p>i'm using void gtk_toolbar_insert (GtkToolbar *toolbar, GtkToolItem *item, gint pos); </p>
  
  <p>If i pass -1 or 0 for pos, it works fine.   But if I try any other position, i get assertion failed.  gtktoolbar.c line 2244 logical==0.</p>
  
  <p>i'm basically followed this code:  except for the position.</p>
  
  <p>#include </p>
  
  <p>int main( int argc, char *argv[])
     {</p>
  
  <pre><code> GtkWidget *window;
   GtkWidget *vbox;
  
   GtkWidget *toolbar;
   GtkToolItem *new;
   GtkToolItem *open;
   GtkToolItem *save;
   GtkToolItem *sep;
   GtkToolItem *exit;
  
  
   gtk_init(&amp;argc, &amp;argv);
  
   window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
   gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
   gtk_window_set_default_size(GTK_WINDOW(window), 250, 200);
   gtk_window_set_title(GTK_WINDOW(window), "toolbar");
  
   vbox = gtk_vbox_new(FALSE, 0);
   gtk_container_add(GTK_CONTAINER(window), vbox);
  
  
   toolbar = gtk_toolbar_new();
   gtk_toolbar_set_style(GTK_TOOLBAR(toolbar), GTK_TOOLBAR_ICONS);
  
   gtk_container_set_border_width(GTK_CONTAINER(toolbar), 2);
  
   new = gtk_tool_button_new_from_stock(GTK_STOCK_NEW);
   gtk_toolbar_insert(GTK_TOOLBAR(toolbar), new, -1);
  
   open = gtk_tool_button_new_from_stock(GTK_STOCK_OPEN);
   gtk_toolbar_insert(GTK_TOOLBAR(toolbar), open, -1);
  
   save = gtk_tool_button_new_from_stock(GTK_STOCK_SAVE);
   gtk_toolbar_insert(GTK_TOOLBAR(toolbar), save, -1);
  
   sep = gtk_separator_tool_item_new();
   gtk_toolbar_insert(GTK_TOOLBAR(toolbar), sep, -1); 
  
   exit = gtk_tool_button_new_from_stock(GTK_STOCK_QUIT);
   gtk_toolbar_insert(GTK_TOOLBAR(toolbar), exit, -1);
  
   gtk_box_pack_start(GTK_BOX(vbox), toolbar, FALSE, FALSE, 5);
  
   g_signal_connect(G_OBJECT(exit), "clicked", 
         G_CALLBACK(gtk_main_quit), NULL);
  
   g_signal_connect_swapped(G_OBJECT(window), "destroy",
      G_CALLBACK(gtk_main_quit), NULL);
  
   gtk_widget_show_all(window);
  
   gtk_main();
  
   return 0;
  </code></pre>
  
  <p>}</p>
  
  <p>thanks</p>