References to grace notes in Slurs are incomplete

[mscuthbert]

Reported by bret.aarden, Jun 25, 2012

Hello,

I just stumbled upon an interesting behavior: references to grace notes in slurs seem to be incomplete. In "mozart/k458/movement3.mxl", for instance, m. 53 has slurs from grace notes to eighth notes. In the slur spanners the eighth notes have intact DefinedContexts, but the grace notes have lost the references to their containing measures. The copies in the slurs also no longer think they're grace notes. Regular notes in the same slur have no such problem. (I first spotted this in the first movement, which has slurs between two grace notes, and in that case both grace notes are afflicted.)

s=corpus.parse('mozart/k458/movement3.mxl')
s[1][167]
<music21.stream.Measure 53 offset=208.0>
s[1][167][1]
<music21.note.Note G>
s[1][167][1].isGrace
True
s[1][167][1].getSites()
[None, <music21.stream.SpannerStorage 4344967056>, <music21.stream.Measure 53 offset=208.0>]
s[1][112]
<music21.spanner.Slur <music21.note.Note G><music21.note.Note F>>
s[1][112][0].isGrace
False
s[1][112][0].getSites()
[None, <music21.stream.SpannerStorage 4344967056>]
s[1][112][1].getSites()
[None, <music21.stream.SpannerStorage 4344967056>, <music21.stream.Measure 53 offset=208.0>]

I'm using v.1.0 on MacOS 10.7 with Python 2.7.

No big problem, now that I know to check for this behavior, but I wanted to bring it to your attention.

Cheers,
-Bret.

[mscuthbert]

I'm following the Enhancement model suggested at http://brianegranger.com/?p=249 -- closing the issue here; if others believe it is important, they can reopen the issue.

[mscuthbert]

probably fixed with some changes since 2015.