Hello list,
normally, horizontal alignment of grobs to other grobs is adjusted using
self-alignment-X and parent-alignment-X—IIRC, this was homogenised some
a couple years ago.
However, when wanting to adjust the alignment of a DynamicTextSpanner’s
left bound, I found that this is much less clear for spanners. They have
the parent-alignment-X component hidden behind the misleading property
name attach-dir, and no default way of adjusting self-alignment-X via
grob property (see this thread [1] for workarounds).
I suggest modifying line-spanner-interface to use self-alignment-X and
parent-alignment-X in all subproperties of bound-details, and heeding
these properties for DynamicTextSpanner and similar grobs.
Best, Simon
[1] https://lists.gnu.org/archive/html/lilypond-user/2022-01/msg00389.html
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