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Move Output_property_engraver to Score level
Due to the hierarchical nature of acknowledgers, acknowledgers in lower
contexts will now get to see the grobs before applyOutput has done its
work. However, grobs are still unfinished (except for type, properties
initialized via context properties and cause) at the time they are
announced, with other details only getting filled in by the engraver
after announcement, so the potential for trouble seems low.
Acknowledgers should usually just register a grob (or write grob data)
with any actual reading of grob data occurring at the end of the
timestep instead or in the process-acknowledged phase.
Also contains commits:
Add Output_property_engraver back to Score
Run scripts/auxiliar/update-with-convert-ly.sh
convert-ly rule for removing Output_property_engraver
It's highly unlikely that users will redefine the Score context from
scratch, so the convert-ly rule just removes every occurence of
Output_property_engraver from user source. Obviously, when running the
rule on the LilyPond code base, we will need to fix up the Score
engraver manually to retain the Output_property_engraver .
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