Comment #8 on issue 2010 by [email protected]: \lyricsto may turn into a
voice-mangling zombie when both parents die at the same time
https://code.google.com/p/lilypond/issues/detail?id=2010
In the NR, I read the following:
Contexts are usually terminated at the first musical moment in which
they have nothing to do. So 'Voice' contexts die as soon as they
contain no events; 'Staff' contexts die as soon as all the 'Voice'
contexts within them contain no events; etc. [...]
There is an exception to this general rule: just one of the 'Voice'
contexts in a 'Staff' context or in a '<<...>>' construct will always
persist to the end of the enclosing 'Staff' context or '<<...>>'
construct, even though there may be periods when it has nothing to do.
The context to persist in this way will be the first one encountered in
the first enclosed '{...}' construct, ignoring any in enclosed '<<...>>'
constructs.
Keith's last example in issue 1551 is particularly illustrative since a
whole measure is basically dead and its material arrives in bulk at the
next measure. Quite interestingly, changing the measure length (like,
doubling it via time signature at the beginning) will also change the
amount of delay with which notes are postponed. So what appears to be
happening is that inside of << \new Voice ... \addlyrics >>, Voice is kept
from dying until addlyrics has finished, and addlyrics is waiting for
another action in the Voice context/iterator to conclude its last
syllable/melisma to be finished.
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