Steps to reproduce:
Run a multithreaded GTK+ app.


Stack trace:
Not necessary.

Other information:
Fix must be:

static void
dfb_events_dispatch (void)
{
  GdkDisplay *display = gdk_display_get_default ();
  GdkEvent   *event;

  GDK_THREADS_ENTER ();
  while ((event = _gdk_event_unqueue (display)) != NULL)
    {
      if (_gdk_event_func)
        (*_gdk_event_func) (event, _gdk_event_data);

      gdk_event_free (event);
    }

  GDK_THREADS_LEAVE ();
}