Re: [Lilypond-auto] Issue 4022 in lilypond: Patch: Allow specifying different alignment for grob and its parent

[lilypond]

Comment #22 on issue 4022 by address@hidden: Patch: Allow specifying  
different alignment for grob and its parent
http://code.google.com/p/lilypond/issues/detail?id=4022

> If we have two separate properties,
> \override LyricText.self-alignment-X = #LEFT will have different
> (and probably quite surprising) output than now.

Up to now, that override aligns the left edge of the lyric with the left  
edge of the note.
LyricText is the /only/ object that uses aligned-on-x-parent, which moves  
reference points on both the object and parent.

For all other objects Grob.self-alignment-X = #Q changes the point Q on  
Grob that is aligned to some fixed point on the parent, that fixed point  
being chosen in various different mysterious ways for each Grob.

> Do you have some idea on how we could mitigate these problems?

Let aligned-on-x-parent interpret
  'parent-alignment-X = ##f
as "please use the same value as for self-alignment-X" (similarly to your  
current patch)
and define LyricText.parent-alignment-X = ##f

For all the other Grob types, if and when you change their default X-offset  
to
self-alignment-interface::aligned-on-parent, also define  
their 'parent-alignment-X
to #CENTER or #LEFT so as to match the former behavior.

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