Comment 2 for bug 1028286

StacktraceTop:
 style_changed_cb (go=<optimized out>, spec=<optimized out>, user_data=<optimized out>) at gtkutil.c:1053
 g_closure_invoke (closure=0x1a7ddd0, return_value=0x0, n_param_values=2, param_values=0x7fff17740d90, invocation_hint=0x7fff17740d30) at /build/buildd/glib2.0-2.33.6/./gobject/gclosure.c:777
 signal_emit_unlocked_R (node=node@entry=0xec39e0, detail=detail@entry=102, instance=instance@entry=0x1074800, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fff17740d90) at /build/buildd/glib2.0-2.33.6/./gobject/gsignal.c:3551
 g_signal_emit_valist (instance=0x1074800, signal_id=<optimized out>, detail=102, var_args=var_args@entry=0x7fff17740fe8) at /build/buildd/glib2.0-2.33.6/./gobject/gsignal.c:3300
 g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.33.6/./gobject/gsignal.c:3356