Engraver not getting an event

[Aaron Hill]

NOTE: I know that \bendAfter currently does not support all of the 
usages below; this all is coming from my investigation into how to 
enable such support.  My plan is to create a patched version of the 
engraver in Scheme as a proof-of-concept; and if it works, I can port 
the results back to C++ and submit a patch to the project.  But I have 
hit an unexpected stumbling block...

Please consider the following:

%%%%
\version "2.19.82"

debug_bend_engraver = #(make-engraver
  (listeners
    ((bend-after-event engraver event)
      (format (current-error-port)
        "\ndebug_bend_engraver: bend-after-event during ~a at ~a"
        (ly:context-current-moment (ly:translator-context engraver))
        (ly:prob-property (ly:event-property event 'music-cause) 
'origin)))))

\layout {
  \context {
    \Voice
    \consists \debug_bend_engraver
  }
}

\fixed g' {
  g \bendAfter #-4 d2.
  <g b>4 \bendAfter #-4 d2.
  <g \bendAfter #-4 b>4 d2.
  << { g4 \bendAfter #-4 } { b4 } >> d2.
}
%%%%

I would expect the above to print out a debug line per each 
bend-after-event.  But oddly the third--the one attached to a note 
within a chord--seems to go missing.

Adding in a \displayMusic doesn't really show anything different about 
the third usage of \bendAfter.  Just like the first and fourth 
occurrences, the bend-after-event is part of the articulations for the 
corresponding note-events.  (The second instance is unique in that the 
event is simply stored at the end of the chord's elements.)

It is my understanding that the event-chord-iterator handles 
broadcasting all of the chord's elements, and then the 
rhythmic-music-iterator will take care of broadcasting the articulations 
for the note-events.  But that does not seem to be happening.

Where have I gone wrong in my thinking?


-- Aaron Hill