Re: automatic accidental style voice: too many written accidentals

[Frédéric Bron]

> Since the \key command still works at the Staff level (both technically in
> LilyPond and musically, since there's no notation available to specify
> separate key signatures for separate voices within a stave), I clearly see
> it as a bug if the Staff key isn't seen by each Voice.

What if, at the point a voice is instanciated, we automatically set
its key signature to that of its parent staff context. That would
solve this issue.
Where can I find the code where voices are instanciated?

Frédéric