def wrapped_done(future: Future) -> None:
assert mw
mw._decrease_background_ops()
# did something go wrong?
if exception := future.exception():
if isinstance(exception, Exception):
if self._failure:
self._failure(exception)
else:
showWarning(str(exception), self._parent)
return
else:
# BaseException like SystemExit; rethrow it
future.result()
