Re: [Lilypond-auto] Issue 3026 in lilypond: staff-padding should measure to the alignment-points

[lilypond]

Comment #12 on issue 3026 by address@hidden: staff-padding should  
measure to the alignment-points
http://code.google.com/p/lilypond/issues/detail?id=3026

That's a point.  The different classes of text
  TextScript
  CombineTextScript
  etc.
have different defaults, such as CombineTextScript is bold, and has  
independent staff-padding.   In my proposed patch I increased the  
staff-padding to the TextScripts so that "apart"  would sit at the same  
height as "chord" if there were no notes in the way, but saw no benefit to  
bring the visually-different bold "a2" in line with the normal-weight  
text.  We could align them.

It is hard to pick a good default 'staff-padding with text, because a  
reasonable 'staff-padding to the baseline above the staff is closer than a  
reasonable distance below the staff.  We could redefine the baseline of  
text to be at the center height of the 'x' in the font, so  
that 'staff-padding works symmetrically.  If applied to Lyrics, it would  
simplify centering Lyrics between staves.  (Different adjustments would be  
needed for other things that go in a TextScript: \fermataMarkup,  
\woodwind-diagrams, \fret-boards, etc.)

I suspect it wisest to remove the default 'staff-padding from TextScript  
(its current broken implementation makes it no different from 'padding) and  
let users apply it when they have a special case where it is useful.

Dynamics text, by contrast, has a baseline near its vertical center,  
so 'staff-padding will be very useful for the DynamicLineSpanner, when it  
works as documented.

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