Comment #2 on issue 1274 by n.puttock: convert-ly does not warn about #'dash-period = #-1 for LyricHyphen
http://code.google.com/p/lilypond/issues/detail?id=1274
This is a weird one, since it shouldn't work in 2.12.3: it has exactly the same code for ly:lyric-hyphen::print as 2.13.34. There's a line in the code which changes 'dash-period if it's smaller than 'length, so negative amounts shouldn't make the line invisible (this really only applies to grobs which support line-interface, whereas LyricHyphen brews its own line via Lookup::round_filled_box ()).
The format changed, but the convert-ly rule (as currently written) only applies to Slur and Tie.
That convert rule is unrelated to this. The one I added in 2.13.31 changed negative 'dash-period to #'style = #'none, but it doesn't apply to LyricHyphen (perhaps it should, but then we'd have to change the stencil callback to use line-interface code).
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