Re: [Lilypond-auto] Issue 4191 in lilypond: Patch: Add an "\or" markup command

[lilypond]

Comment #19 on issue 4191 by address@hidden: Patch: Add an "\or" markup command
https://code.google.com/p/lilypond/issues/detail?id=4191

Well, \null is not all that visible, but it's not like I have better  
suggestions.  It seems to lead to misunderstandings though:

    \choose-visible might be useful before joining markups with a separator.

If we are talking about "joining markups with a separator", _empty_  
stencils have to be removed _anyway_ because they don't have tangible  
dimensions (as opposed to point-stencil, for example).  IIRC, we have the  
following correspondences:

"" -> empty-stencil, dimensions (+inf,-inf) (+inf,-inf), namely  
empty-interval
\null -> point-stencil, dimensions (0,0) (0,0)

which is fabulously intuitive once you start working with stencils.  We  
would not want to have things get too easy.  \null/point-stencil do not  
produce anything visible, but you can space it, attach things to it, put  
separators before and behind it.  It does not count as an empty stencil,  
though.  An empty stencil is not just invisible but unhandable and  
unstackable.  So anything that stacks stencils with delimiters in between  
needs to throw away empty stencils anyway.

A special case are stencils with only one axis having empty dimensions.  If  
you stack those in the direction of emptiness, they should likely not count  
in the direction of stacking but may affect the dimensions in the non-empty  
direction (it may be that the stacking primitives don't follow  
this "correct" behavior).  And stacking in the direction of non-emptiness  
causes spacing but does not affect the resulting bounding box of the  
stacked material in non-stacking axis direction.

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