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Re: LSR 507 (ghost voice) broken since 2.15.28

From: David Kastrup
Subject: Re: LSR 507 (ghost voice) broken since 2.15.28
Date: Thu, 16 May 2013 12:07:20 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

Eluze <address@hidden> writes:

> LSR 507 <http://lsr.dsi.unimi.it/LSR/Item?id=507> produces erroneous
> code since version 2.15.28:
> mus = { c4 d e f |}
> \displayLilyMusic \ghostMusic \mus

That's fallout from issue 2240, Patch: Don't wrap EventChord around
rhythmic events by default.  It won't be the only affected item.

The basic question is when should we be migrating the LSR to 2.16.

In this particular case, only the first of several "adjacent" spacers is
retained.  The reason for that apparently is to avoid <c e> getting
turned into what amounts to <s s>.  I don't think that this
simple-minded approach is all too likely to lead to sane results without
more effort, even pre-2.15.28.  So my take on this would be to just junk
the music-filter expression.  This is going to lead to constructs
occasionally that one can't actually enter, but which should at least
compile reasonably well.

David Kastrup

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