Re: \stopStaff \startStaff bug

[Jean Abou Samra]

Le 07/01/2023 à 16:48, Kieren MacMillan a écrit :
> Hi all,
>
> > [  It sometimes makes me wonder if we need a concept of "infinitesimal
> > time", to allow disambiguating  ]
> >
> > Yes, the concept of 0-cycles, that can be allowed to execute in order for 
> > decisions to be made at the end of the timestep once all the 0-cycles have 
> > completed, seems like a good idea.
> That might even be a liminal space in which the infamous Grace Music Bug™ could 
> be handled grace-fully…?



Actually, that is what originally made me muse about this ...

Issue #34 is, in my opinion, a perfectly unsolvable problem, because
it's asking LilyPond to guess things that can't be determined with
certainty from the user input, and it is practically impossible in
general to guess these without reading the user's mind. Therefore,
my preferred way of handling it would be to add a command sparing
the need to compute the duration of the grace group, as a way
to replace grace skips.

<<
  { \grace { c'8 d'8 } c'1 }
  {
    \once \override Staff.TimeSignature.color = "red"
    \grace s4 % => \dt  ???
    \once \override NoteHead.color = "red"
    c'1
  }
>>


If we additionally require the user to add \dt (or grace
skips) when there is such an ambiguity, by emitting a
warning/error in such cases, there will be no confusion for
users, and the problem will be kind of solved, even if not
in the way that most people would like but is in fact
hardly possible.

Again: implementation handwaving, and I'm definitely not
going to look at this anytime soon.

Best,
Jean

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