Quite famous 3rd party themes such as numix defines these... So I didn't want to break them too, but indeed is something we could you think that to be cleaner.
However... I really think that the best way is to use a parent selector too..
I've pushed a change, let me know if it works correctly in your case too.
I'll change unity in the future, but I'd prefer to ensure the theme applies to your case only.
Quite famous 3rd party themes such as numix defines these... So I didn't want to break them too, but indeed is something we could you think that to be cleaner.
However... I really think that the best way is to use a parent selector too..
I've pushed a change, let me know if it works correctly in your case too.
I'll change unity in the future, but I'd prefer to ensure the theme applies to your case only.