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Re: (scheme-)engraver in 2.20/21

From: David Kastrup
Subject: Re: (scheme-)engraver in 2.20/21
Date: Thu, 24 Sep 2020 17:10:40 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Jan-Peter Voigt <> writes:

> Hi all,
> after some other very involving projects I can now refocus on lilypond :-)
> I probably missed a change in 2.20/21. If I create a scheme-engraver the
> "start-translation-timestep" slot is not called, if the "initialize"
> slot has been called in this particular timestep. If this the intended
> behaviour I appreciate it because it is consistent.

I think it is consistent, but the rule is different.
start-translation-timestep is not called for _implicitly_ instantiated
contexts since their instantiation occurs _after_ the general
start-translation-timestep phase.  For _explicitly_ instantiated
contexts (like \new Voice ...) I think it is being called.

No guarantees, but that's the way I remember.

David Kastrup

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