Completion_heads_engraver and \noBreak

[ornello]

The \noBreak command seems not to work with automatically tied notes when
using the Completion_heads_engraver.

In the example below, two line breaks are produced although I added \noBreak
after each note. When removing the Completion_heads_engraver or the first
quarter note, everything works as desired, i.e. all notes are put into one
line.

Is this a bug or am I missing something? Is there another way to avoid line
breaks with automatically tied notes?

Thanks for any help...

-------------------

\version "2.12.3"

\layout {
\context {
\Voice
\remove "Note_heads_engraver"
\consists "Completion_heads_engraver"
}
}

{
c4
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
c1 \noBreak
}

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