Comment 2 for bug 1298108

StacktraceTop:
 flush_changes (visual=0x0, command=0x0, enabled_p=0, list_elt=<optimized out>, s=<optimized out>) at ./demo-Gtk.c:1278
 flush_checkbox (model=<optimized out>, path=<optimized out>, iter=<optimized out>, data=0x7fff66af3f00) at ./demo-Gtk.c:1459
 gtk_tree_model_foreach_helper (model=model@entry=0x192d2a0, iter=iter@entry=0x7fff66af3e90, path=path@entry=0x1a16080, func=func@entry=0x416000 <flush_checkbox>, user_data=user_data@entry=0x7fff66af3f00) at /build/buildd/gtk+2.0-2.24.23/gtk/gtktreemodel.c:1607
 IA__gtk_tree_model_foreach (model=0x192d2a0, func=func@entry=0x416000 <flush_checkbox>, user_data=user_data@entry=0x7fff66af3f00) at /build/buildd/gtk+2.0-2.24.23/gtk/gtktreemodel.c:1653
 flush_dialog_changes_and_save (s=0x7fff66af4980) at ./demo-Gtk.c:1505