Allow nested span with inherited styles

It's not possible to have nested spans that inherit the parent's styles. One migth expect this however:

[ ] span!(bg="red", [span!(fg="white", ["Error"]),]); shows the word "Error" as white text on red background.

What do you think? Is this a good idea or not?

This is because of this reset call:

It might make sense to call this here instead/additionally:

killercup / convey