[gtkmm] Gtk::Combo BUG?

["Serge S. Fukanchik" <fuxx mail ru>]

Hi,
i need to clear combo drop down list, but every Gtkmm solution
i tried so far, fails to do so.

It looks natural to use following construct:

combo.get_list()->children().clear ();

get, list of drop down children and clear it,
but this code segfaults in my simple test case (please see attached
source), and i ended with use of gtk_list_clear_items:

gtk_list_clear_items ( GTK_LIST ( combo.get_list ()->gobj() ), 0, -1 );

So, what is `correct' way of removing items from Combo Drop Down?
And why `clear' method in class HelperList is implemented as
erase ( begin, end ) instead of just call to gtk_list_clear_items?

--
fuxx

#include <gtkmm.h>
#include <gtk/gtklist.h>

class MyWindow: public Gtk::Window
{
public:
  MyWindow ();
private:
  void clear1_cb ();
  void clear2_cb ();

  Gtk::VBox   vbox;
  Gtk::Button clear1_button;
  Gtk::Button clear2_button;
  Gtk::Combo  combo;
};

void MyWindow::clear1_cb ()
{
  combo.get_list()->children().clear ();
}

void MyWindow::clear2_cb ()
{
  gtk_list_clear_items ( GTK_LIST ( combo.get_list()->gobj() ), 0, -1 );
}

char *items[]={
 "first",
 "second",
 "third",
 "last",
 0
};

MyWindow::MyWindow ()
 : clear1_button ( "Clear and fail" ),
   clear2_button ( "Clear and work" )
{
  set_title ( "Combo test" );
  add ( vbox );
  vbox.pack_start ( combo, Gtk::PACK_EXPAND_WIDGET, 5 );
  vbox.pack_start ( clear1_button, Gtk::PACK_SHRINK, 5 );
  vbox.pack_start ( clear2_button, Gtk::PACK_SHRINK, 5 );
  show_all ();
  std::vector < Glib::ustring > strings;
  for ( int i = 0; items [ i ]; i++ )
  {
    strings.push_back ( items [ i ] );
  }
  combo.set_popdown_strings ( strings );
  clear1_button.signal_clicked ().connect ( SigC::slot ( *this, &MyWindow::clear1_cb ) );
  clear2_button.signal_clicked ().connect ( SigC::slot ( *this, &MyWindow::clear2_cb ) );
}

int main ( int argc, char *argv[])
{
  Gtk::Main kit(argc, argv);
  MyWindow window;
  
  window.show ();

  Gtk::Main::run(window);
  return 0;
}