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accidentals bug

From: Rune Zedeler
Subject: accidentals bug
Date: Tue, 16 Apr 2002 22:59:16 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020313

I just found an undocumented feature in my accidentals patch, illustrated by the following ex.

\score {
    \context Voice \notes \transpose c'' {
            \property Staff.autoAccidentals = #'(Staff (any-octave . 0))
            < cis'1 c > < c cis' >
    \paper {
        linewidth = -1

In the first chord the algorightm works: the cis gets sharp - and the c sees that the cis was there and hence gets a natural sign. In the 2nd chord (the same chord with notes in different order) it goes wrong: the c doesn't know that the cis will come and hence doesn't know that it needs a natural sign.

It will be quite tricky to fix this properly (and it will SLOW DOWN lilypond) - and the problem will occur very seldom - only when having the same note with different accidentals occuring simultainously.

I think that it will suffer to leave a note in the documentation about this... At least until 1.7.


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