Re: [Lilypond-auto] Issue 3888 in lilypond: Completion_heads_engraver hangs after \time in mid-measure

[lilypond]

Comment #7 on issue 3888 by address@hidden: Completion_heads_engraver  
hangs after \time in mid-measure
http://code.google.com/p/lilypond/issues/detail?id=3888

> a meter change that does not lend itself to properly representing an  
> anacrusis

Something like this?

{ \time 2/4 d4
  \time 6/8 \partial 4. r4 a8 | d4 ... }

Also, concatenating pieces with anacruses can put \time in midmeasure,  
where it ought to be harmless:

{ { \time 2/4 ... | d4 r8 }
  { \time 2/4 \partial 8 e8 | a } }

To prevent measureLength < measurePosition, should \time preserve the time  
remaining in the measure, or just set measurePosition to zero? Maybe this  
doesn't matter, since it's generally not obvious what measurePosition  
should be, so \partial is practically required. That makes it a convenient  
way to suppress the warning -- \partial makes measurePosition negative,  
which is easy for \time to ignore.

> it could be faked by inserting an invisible barline

As a way to suppress the warning? (It doesn't help with the measurePosition  
problems.) ignoreBarChecks would also work, and might be more intuitive.

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