Re: Issue 787 in lilypond: script stack order fails with 2 more notes

[lilypond]

Updates:
        Status: Started
        Labels: -fixed_2_13_9

Comment #6 on issue 787 by n.puttock: script stack order fails with 2 more  
notes
http://code.google.com/p/lilypond/issues/detail?id=787

This is still not quite right, as Reinhold has found out with the regtest
accidental-suggestion.ly.

If there's only one stacking direction, the new code causes a segfault,  
since it
calls scm_car (null) in the other direction.

This fails,

\relative c' {
  c4-"1"-"2"
}

whereas this works:

\relative c' {
c4-"1"^"2"
}

Then there's another issue with scm->double robustness; if you apply  
Reinhold's patch
for the above bug, the following still fails due to some grob properties  
returning
'() if unset (I haven't checked exactly but it's probably  
default_outside_staff):

\relative c' {
  c4\turn ^"1"^"2"
}

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