Comment 2 for bug 1430204

StacktraceTop:
 on_screen_size_changed (screen=0x1a3d130, manager=0x1a624e0) at msd-background-manager.c:272
 _g_closure_invoke_va (closure=0x1a3d130, closure@entry=0x1b0e130, return_value=return_value@entry=0x0, instance=0x1, instance@entry=0x1a3d130, args=0xffffffff, args@entry=0x7fff78c40e08, n_params=1160055008, param_types=0x0) at /build/buildd/glib2.0-2.43.91/./gobject/gclosure.c:831
 g_signal_emit_valist (instance=0x1a3d130, signal_id=<optimized out>, detail=0, var_args=0x7fff78c40e08) at /build/buildd/glib2.0-2.43.91/./gobject/gsignal.c:3214
 g_signal_emit_by_name (instance=instance@entry=0x1a3d130, detailed_signal=0x0, detailed_signal@entry=0x7f075dbabd58 "monitors-changed") at /build/buildd/glib2.0-2.43.91/./gobject/gsignal.c:3401
 process_monitors_change (screen=0x1a3d130) at /build/buildd/gtk+2.0-2.24.27/gdk/x11/gdkscreen-x11.c:1163