Re: [Lilypond-auto] Issue 3850 in lilypond: Regression test 'grace-end.ly' generates a programming error

[lilypond]

Comment #3 on issue 3850 by address@hidden: Regression  
test 'grace-end.ly' generates a programming error
http://code.google.com/p/lilypond/issues/detail?id=3850

This time the problem is in layout, not timing.  
Spanner::do_break_processing breaks spanners at all potential breakpoints,  
and (at line 99) assumes any breakpoints that aren't in a system must be  
prebroken. But the right end of the GraceSpacing spanner is the PaperColumn  
at the end of the score, which is not in any system and is not prebroken.  
(It's also not a possible breakpoint, so maybe it shouldn't even be  
considered.)

Issue 3851 is the same.

This may affect other spanners that end at the end of the score (and maybe  
at other odd places, if there are any).

\afterGrace c4 { d16 d16 } isn't affected, because the grace notes are 1/16  
earlier -- it expands to << c4 { s8. \grace { d16 d } } >>.

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