K460 does not compile under 2.6.0

[Sebastiano Vigna]

I don't want to seem iterative, but my source for K460
(http://vigna.dsi.unimi.it/music/K460.ly) does not compile still with
2.6.0. Problems start with the appoggiatura at measure 28.

I would like just to know if the answer is "won't fix", as I will try to
fiddle with the source to see whether I can work around it. If anybody
can suggest a workaround, I'd be immensely grateful.

BTW, there seems to be a significantly difference in the way text is
handled. I used to write 1900$-$2000 for date ranges, as the correct
minus is produced by $-$ in TeX, but now I get $-$ in the text. convert-
ly apparently does not take into account this problem. Not a big issue,
anyway.
-- 
Ciao,

                                        seba