Re: [Lilypond-auto] Issue 1063 in lilypond: Reverting nested property fails to restore default value if preceded by override in same grob

[lilypond]

Comment #13 on issue 1063 by address@hidden: Reverting nested property fails  
to restore default value if preceded by override in same grob
http://code.google.com/p/lilypond/issues/detail?id=1063

Here is something possibly related but worse (note that a plain \override  
starts with a \revert that should not have done anything here):
{
  \override Staff.BarLine.allow-span-bar = ##t
  \override Staff.BarLine.space-alist.time-signature.extra-space = #3.0
}
results in
Interpreting  
music.../usr/local/tmp/lilypond/out/share/lilypond/current/scm/lily-library.scm:240:5:  
In procedure ly:book-process in expression (process-procedure book  
paper ...):
/usr/local/tmp/lilypond/out/share/lilypond/current/scm/lily-library.scm:240:5:  
Wrong  
type (expecting pair): extra-space

It is actually the implied \revert in the second \override which triggers  
the problem: using \revert alone is sufficient for getting it, using  
\temporary\override will not trigger it.

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