Don't call g_signal_handler_disonnect() if priv->model is NULL. (#136551,

Don't call g_signal_handler_disonnect() if priv->model is NULL. (#136551,

Mon Mar  8 11:57:27 2004  Owen Taylor  <otaylor@redhat.com>

        * gtk/gtkcombobox.c (gtk_combo_box_unset_model): Don't
        call g_signal_handler_disonnect() if priv->model is
        NULL. (#136551, Damon Chaplin)

        * gtk/gtkcombobox.c (gtk_combo_box_model_row_inserted):
        Back out code to set the active item when the first
        item is added to the model; this causes problems for
        GtkComboBoxText. (#136535)

        * gtk/gtkcombobox.c (gtk_combo_box_menu_destroy)
        * gtk/gtkcombobox.c (gtk_combo_box_list_destroy):
        * gtk/gtkcombobox.c (gtk_combo_box_list_setup):
        * gtk/gtkcombobox.c (gtk_combo_box_menu_setup):
        Remove calls to gtk_combo_box_unset_model.

        * gtk/gtkcombobox.c (gtk_combo_box_check_appearance):
        Clean up handling of wrap->width > 0.

        * gtk/gtkcombobox.c (gtk_combo_box_relayout): Don't
        switch list/menu mode here.

        * gtk/gtkcombobox.c (gtk_combo_box_set_model): Protect
        against the same model being set back.

        * gtk/gtkcombobox.c (gtk_combo_box_relayout): Call
        gtk_combo_box_menu_fill() rather than duplicating
        a large chunk of code.