How are dynamics (self-)aligned exactly?

[Valentin Villenave]

Greetings,

could anyone give me a hint as to where dynamics alignment is handled?
As far as I can see, the self-alignment-interface functions are not
used by the (formerly new) dynamic-engraver; and AFAICS the following
diff doesn’t break compiling nor change any of the regtests:

diff --git a/lily/dynamic-engraver.cc b/lily/dynamic-engraver.cc
index ebfd4389f6..771996d19b 100644
--- a/lily/dynamic-engraver.cc
+++ b/lily/dynamic-engraver.cc
@@ -23,7 +23,7 @@
 #include "item.hh"
 #include "note-column.hh"
 #include "pointer-group-interface.hh"
-#include "self-alignment-interface.hh"
+// #include "self-alignment-interface.hh"
 #include "spanner.hh"
 #include "stream-event.hh"
 #include "text-interface.hh"

Any clue?

Cheers,
-- V.