Re: [Lilypond-auto] Issue 2717 in lilypond: Patch: Implement \hidden/\hide as shorthands for \tweak/\override #'stencil = ##f

[lilypond]

Comment #20 on issue 2717 by address@hidden: Patch: Implement  
\hidden/\hide as shorthands for \tweak/\override #'stencil = ##f
http://code.google.com/p/lilypond/issues/detail?id=2717

Hi David,
How will we document \once and \single so they don't get confused?
Am I correct in these assumptions re \once and \single?

\once = "do the following commands and only apply them to a single  
time-step (moment in LilyPondish) in the score"

\single = "apply this modification to a one unique property or sub-property  
relevant particular graphic object (grob) within some LilyPond context or  
other"

Could you ever get user code specifying \once and \single together?

In everyday usage "once" and "single" are sort-of synonymous, if there  
isn't a more specific name for \single that isn't too long, ugly or both,  
let's make it clear in big, friendly letters how different they are in the  
docs.

(When you frame your reply for me - imagine you're explaining it to Winni  
and Fridolin - and then make a few more allowances because they've got  
horse-sense!)

Cheers,
Ian