Re: Issue 153 in lilypond: \once \set fails to restore previous setting

[-Eluze]

lilypond-4 wrote:
> 
> 
> Comment #8 on issue 153 by address@hidden: \once \set fails to restore  
> previous setting
> http://code.google.com/p/lilypond/issues/detail?id=153
> 
> I don't understand this issue.  As far as I understood, context properties  
> (which are set with \set) are set and consulted when the context material  
> is assembled, more or less immediately.
> 
> \once, however, is applied when the assembled context is iterated.   
> \override and \once\override register events that are associated with a  
> certain time step and change a property at the given time.
> 
> \set is not associated with a time or an event.  It is executed when  
> encountered.
> 
> So what is \once\set supposed to mean?  When is its meaning supposed to be  
> reverted?  It can't be when the time advances, since \set is not
> associated  
> with a time.
> 
> 

actually i don' feel like discussing time problems with the technical
approach to \set properties. if Lilypond cannot do it then let's live with
it and forget about \once \set in conjunction with fingeringOrientations or
others.

of course then the documentation should not mention the pointless
possibility of using \once \set  - or are there other situations where it
makes sense?


also i'd like to come back to one point that nearly vanished during this
discussion:

it would be very practical if one could define fingeringOrientations per
voice  (and not on the Score level). the advantage: if you once change the
fingerin policy - e.g. from left to right - you can \unset this and
automatically the Voice setting would be recovered - this is much easier
than redefining the voice specific fingeringOrientations.

can this be taken as a feature/enhancement request?

thanks
Eluze




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