fixed GNOME/gnome-todo#73
apparently, 'gtk_widget_class_bind_template_callback (widget_class, gtd_list_selector_panel_on_key_press_event);' called handler function only once. This tweak fixes the issue.
apparently, 'gtk_widget_class_bind_template_callback (widget_class, gtd_list_selector_panel_on_key_press_event);' called handler function only once. This tweak fixes the issue.