Issue 3296: Move Tweak_engraver to Score level

This makes it possible to tweak items announced at Score level, like
MetronomeMark and RehearsalMark.

The advantage is that tweaks will be applied once regardless of the
context structure (the Score context should exist only once).

Due to the hierarchical nature of acknowledgers, acknowledgers in
lower contexts will now get to see the grobs before tweaks have been
applied.  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.

diff --git a/ly/engraver-init.ly b/ly/engraver-init.ly
index d1f284da94e0ce221f18c8c9a2f26ac8580a7353..5902b25da9833d050b29a8287f5abb4d44d16ab7 100644 (file)
--- a/ly/engraver-init.ly
+++ b/ly/engraver-init.ly
@@ -231,7 +231,6 @@ multiple voices on the same staff."
   \consists "Note_heads_engraver"
   \consists "Dots_engraver"
   \consists "Rest_engraver"
-  \consists "Tweak_engraver"
 
   %% switch on to make stem directions interpolate for the
   %% center line.
@@ -404,7 +403,6 @@ a collection of staves, with a bracket in front and spanning bar lines."
   \consists "Text_spanner_engraver"
   \consists "Font_size_engraver"
   \consists "Axis_group_engraver"
-  \consists "Tweak_engraver"
 
   pedalSustainStrings = #'("Ped." "*Ped." "*")
   pedalUnaCordaStrings = #'("una corda" "" "tre corde")
@@ -440,7 +438,6 @@ printing of a single line of lyrics."
   \consists "Lyric_engraver"
   \consists "Extender_engraver"
   \consists "Hyphen_engraver"
-  \consists "Tweak_engraver"
   \consists "Stanza_number_engraver"
   \consists "Instrument_name_engraver"
   \consists "Font_size_engraver"
@@ -548,6 +545,7 @@ automatically when an output definition (a @code{\\score} or
   \consists "Timing_translator"
   \consists "Default_bar_line_engraver"
   \consists "Output_property_engraver"
+  \consists "Tweak_engraver"
   \consists "System_start_delimiter_engraver"
   \consists "Mark_engraver"
   \consists "Volta_engraver"