Completion_heads_engraver doesn't play nicely with lyric alignment

[Alexander Kobel]

Hi all,

I'd expect the two scores in the following excerpt to be identical, alas 
they aren't: Notes splitted into tied notes by the 
Completion_heads_engraver produce melismata as expected, but don't cause 
the Lyrics to be left-aligned accordingly. (See the attached output.)


\version "2.19.82"

\paper { ragged-last = ##f }

\score {
  { c'4 c'4 c'4 c'4~ c'4 }
  \addlyrics { This should be left-aligned. __ }
}

\score {
  { c'4 c'4 c'4 c'2 }
  \addlyrics { This should be left-aligned. __ }
  \layout {
    \context {
      \Voice
      \remove Note_heads_engraver
      \consists Completion_heads_engraver
    }
  }
}


Unfortunately, this seems to imply that there is no easy/clean way to 
produce a Mensurstriche layout and a "standard" layout with splitted 
notes from the same source.
In case this is a known (but, in this case, AFAICS undocumented) flaw, 
or unlikely to have an easy fix: I'd be happy to hear about an 
workaround for same-source ditions, if someone has one in mind.


Cheers,
Alex

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