rem: gtk_widget_grab_focus ( tree_view_liste_echeances );
add: gtk_widget_grab_focus ( tree_view_scheduler_list );
context: void echap_formulaire_echeancier ( void ){    formulaire_echeancier_a_zero();    gtk_widget_grab_focus ( tree_view_liste_echeances );    if ( !etat.formulaire_echeancier_toujours_affiche )	gtk_expander_set_expanded ( GTK_EXPANDER(frame_formulaire_echeancier), FALSE );}