Re: [Lilypond-auto] Issue 3330 in lilypond: bracketify-stencil moves grob's refpoint

[lilypond]

Comment #8 on issue 3330 by address@hidden: bracketify-stencil moves  
grob's refpoint
http://code.google.com/p/lilypond/issues/detail?id=3330

Yes, what the patch above does seems obviously correct.  A construction  
like (☺) where ☺ is something that is usually centered, would be expected  
to have its left extent '[', its reference point '.', and its right  
extent ']' arranged like this:
  [  .  ]

That would be fine if LilyPond spaced markup in a line using the extents,  
placing ']' against the '[' of the next markup.

However, LilyPond spaces markup by placing the the reference point '.'  
relative to the end ']' of the extent of the markup to the left.    That  
means the left extent of a markup '[  .' backspaces onto whatever is at its  
left.  If we put something like (☺) in a sentence it backspace over the  
object to its left.

Historically, backspace was encoded as a zero-length markup arranged like  
this:
  ][    .
This kind of backspace would not move the cursor if we spaced markups in a  
line based on extents.

Issue 732 tried to place markups in a line based on extents, breaking  
backspacing.  While fixing the backspace, I made backspace into  
negative-length :
  ]   .[
Now backspace should work if we place markups in a line based on extents.   
I did not, however, keep that aspect of the original patch, because that  
aspect of the patch did not solve any problems identified in the issue.

I think the patch above, together with a change to place markups in a line  
based on extents, would make everything simpler.  The question is whether  
it works for existing uses.

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