programming error: note-column has no direction

[Thomas Morley]

Hi,

this came up in the german forum:
https://lilypondforum.de/index.php/topic,1280.msg6613.html

A more minimel example:

\version "2.24.2"

%% \include "gregorian.ly"
%%
%% \layout {
%%   \context {
%%     \GregorianTranscriptionVoice
%%     \consists Stem_engraver
%%     \omit Stem
%%   }
%% }

\new GregorianTranscriptionStaff
  <<
    \new GregorianTranscriptionVoice
    { \voiceOne b' }
    \new GregorianTranscriptionVoice
    { \voiceTwo g' }
  >>

Returns:
programming error: note-column has no direction
    { \voiceOne
                b' }

Looks like its triggered by the removed Stem_engraver in 2.24., thus a
first fix is to reconsist said engraver and omit Stems.

Is this a valid bug?


Thanks,
  Harm