Re: \stopStaff \startStaff bug

[Kieren MacMillan]

p.s.

> In this case (as with so many!) the problem isn't moment-bleed, it's 
> context-bleed: the grace music doesn’t apply to the lower staff, and thus 
> shouldn’t be included in decision-making there; likewise, the clef doesn’t 
> apply to the upper staff, and so shouldn’t be included in the decision-making 
> there.

By “decision-making” here, I mean the “what grobs need to appear in each 
context” decisions, not the horizontal spacing decisions that would [at least 
for a human engraver] come after that.

— Kieren