Re: Change of RehearsalMark behaviour

[Valentin Petzel]

Hello David,

It’s not very complicated: The old behaviour uses one Mark_engraver to handle 
mark events and place marks. The new behaviour has the 
Mark_tracking_translator which handles the mark events and decides to whether 
to have the Mark_engraver create a mark.

So when the Mark_engraver is at Staff level and the Mark_tracking_translator 
is at Staff level each mark event will be handles in the respective staff and 
sent to the corresponding Mark_engraver. But if the Mark_tracking_translator 
is on Score level it will handle all mark events that appear within the score 
and send them to all Mark_engravers within the score, which means that each 
Staff will get every Mark.

Cheers,
Valentin

Am Dienstag, 21. Dezember 2021, 00:15:56 CET schrieb David Sumbler:
> On Mon, 2021-12-20 at 18:20 +0100, Jean Abou Samra wrote:
> > Le 20/12/2021 à 16:18, David Sumbler a écrit :
> > > I set a piece a while ago using Lilypond 2.19.48.  It consists of 2
> > > staves, and I used \mark for some annotations that I wanted to
> > > appear above or on barlines - mostly the "crotchet - dotted
> > > crotchet" type of thing.  Sometimes these only applied to one of
> > > the staves, so I would specify the mark in the music for the
> > > appropriate staff.  I added:      \layout {\context {
> > > \Score   \remove Mark_engraver }\context { \Staff   \consists
> > > Mark_engraver }      }and it all worked just as intended.
> > > I was recently asked to make a new version of the piece.  The main
> > > change is from a male voice to a female one, but this necessitated
> > > a few changes in the other (instrumental) staff.  I ran convert-ly
> > > on copies of the original files as I now had Lilypond 2.23.4
> > > installed.  I then edited these to produce the new version
> > > Unfortunately the behaviour of RehearsalMark seems to have changed.
> > > 
> > >  Whereas previously a mark only appeared over the staff whose music
> > > 
> > > it was specified in, I find that now all of the marks appear in
> > > both staves, regardless of which staff they are intended for.
> > > Is this a bug or an intentional change?  And is there another way I
> > > can use marks to get the result I want and previously had?
> > 
> > This change was intended, see the top entry at
> > http://lilypond.org/doc/v2.23/Documentation/changes/index.html
> > 
> > To get the old behaviour, also move theMark_tracking_translator, like
> > this:
> > 
> > \version "2.22.1"
> > \layout {   \context {     \Score     \remove Mark_engraver
> > \remove Mark_tracking_translator   }   \context {     \Staff
> > \consists Mark_engraver     \consists Mark_tracking_translator   }}
> > <<   \new Staff { \mark \default c'1 }   \new Staff { c'1 \mark
> > \default } >>
> > 
> > Regards,Jean
> 
> Thank you for that.  A nice, simple fix to implement.  I must say,
> though, that I'm having a bit of difficulty getting my head around the
> new behaviour!
> 
> David

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