bug in lyric syllable magnetic snap

[Alexander Kobel]

Hi David, hi Mike, hi all,

I sometimes (still use Lilypond, and when I do, I typically use) your 
wonderful snippet for snapping "close" syllables into a single token.

(For those who don't know this contribution: it's meant to get rid of 
unpleasant thin-space gaps between syllables in cramped conditions, when 
LyricHyphens are not shown, but there's a "kerning" problem due to the 
fact that syllables are engraved as separate entities.)

Now I stumbled across an issue with that: two syllables are combined 
which are clearly far apart; see the attached screenshot and reduced 
working example from an actual engraving. It's not exactly minimal, but 
at least it's reasonably short and shows the problem. And the exact 
circumstances when the bug occurs are not clear to me, and it's somewhat 
sensitive to reduction.

According to my tests, it's related to the facts that there is

(1) a hyphen *before* the syllable "bor" in "ver -- bor -- gen" in the 
alto part;

(2) a line break exactly there (moving the break "remedies" the 
problem); and

(3) another voice/staff simultaneously (commenting out the soprano 
mitigates the issue as well).

It's not, however, related to the accidental in the soprano, or the fact 
that the whole note in the lower voice is wider than the quarter in the 
upper voice (replacing d'1 by d'4*4 doesn't help).


Any thoughts on what goes wrong here, and about a possible fix or 
workarounds?


[ In case you wonder: it's an excerpt of Heinrich Schütz' "Die Himmel 
erzählen", converted from James Gibb's contribution 46745 to CPDL 
(engraved in Capella) via musicxml2ly. I mainly want to fix a couple of 
minor spelling errors; the conversion worked fairly pleasant in general. ]


Cheers,
Alex

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