Comment 2 for bug 1371857

StacktraceTop:
 ?? ()
 g_closure_invoke (closure=0x2cb9fb0, return_value=0x0, n_param_values=2, param_values=0x7fffc2b9e920, invocation_hint=0x7fffc2b9e8c0) at /build/buildd/glib2.0-2.41.5/./gobject/gclosure.c:768
 signal_emit_unlocked_R (node=node@entry=0x1f98b90, detail=detail@entry=1298, instance=instance@entry=0x2409350, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fffc2b9e920) at /build/buildd/glib2.0-2.41.5/./gobject/gsignal.c:3553
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7fffc2b9eab0) at /build/buildd/glib2.0-2.41.5/./gobject/gsignal.c:3309
 g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.41.5/./gobject/gsignal.c:3365