cfdb946992
Under extreme race conditions (window A close at the same time as window B create), there can be multiple windows with same id in compton's window list. If at this point window B closes itself as well, finish_destroy_win might destroy a different window as what's passed to destroy_callback. This can be a problem because someone can still hold a reference to that window (e.g. 't' in paint_preprocess), and there's no way to clear that reference. If finish_destroy_win always destroy the same window passed to destroy_callback, this will not be a problem.