Re: key-change-event listener in 2.20

[Aaron Hill]

On 2020-08-31 8:15 am, Maurits Lamers wrote:
> Hi all,
>
> I just noticed that in Lilypond 2.20 the key signature listener in my
> braille system doesn't get called anymore, where under 2.18.2 it does.
> I added a code sample below where I show how I attach the listeners.
> All the other events seem to be called in the normal way. Did anything
> change in the mean time?

Something else must be going on, because the following works in 2.18.2 
and 2.20.0:

%%%%
\version "2.18.2"

#(define (format-event engraver event)
  (let ((origin (ly:prob-property event 'origin)))
    (ly:input-message origin "found event here")))

\new Voice \with {
  % Using make-engraver macro:
  \consists
  #(lambda (context)
    (make-engraver
      (listeners
        ((key-change-event engraver event)
          (format-event engraver event)))))

  % Manually constructed:
  \consists
  #(list
    (cons 'listeners
      (list
        (cons 'key-change-event format-event))))
} { \key g \major g'2 b' | \key aes \major c''2 aes' }
%%%%


-- Aaron Hill