Re: \stopStaff \startStaff bug

[Kieren MacMillan]

Hi all,

> You cannot let the second Staff start after the grace note.

David’s interpretation of my idea isn’t correct. I never suggested letting the 
second Staff start after the grace note, simply that decisions for that Staff 
should be made independently of the Staff that contains the grace music.

Here’s a set of rules that handles this issue without a problem that I can see:

1. Determine which contexts are affected by G.

2a. Determine all grobs and events (e.g. overrides) in each Staff that aren’t 
affected by G.
2b. Split non-affected contexts into pre-G and post-G portions.

3a. Determine all grobs and events (e.g., overrides) in each Staff affected by 
G.
3b. Split affected contexts into pre-G, G, and post-G portions.

4. Determine spacing, taking into account all portions as determined above.


So in this “clef at the beginning” example, my rules map to logic as follows:

1. Upper staff is affected by G; lower staff isn’t.

2a. Lower staff should include: bass clef, time signature, and note.
2b. Bass clef and time signature are pre-G; note [and any note-attached 
zero-duration events!] is post-G.

3a. Upper staff should include: treble clef, time signature, grace note, and 
note.
3b. Treble clef and time signature are pre-G; grace note is G; note is post-G

4. Proceed as per normal spacing rules.


Happy to hear comments about the rules and logic outlined above.

Cheers,
Kieren.